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第一章 声现象 基础知识 回声测(The first chapter is the basic knowledge of acoustic phenomena)

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第一章 声现象 基础知识 回声测(The first chapter is the basic knowledge of acoustic phenomena)第一章 声现象 基础知识 回声测(The first chapter is the basic knowledge of acoustic phenomena) 第一章 声现象 基础知识 回声测(The first chapter is the basic knowledge of acoustic phenomena) ? {N Hao 餢 皊 a? 鹡 @ x 鍂 Xue 轛 餢 Km 輱 粂 2 s = vt , {N 倐 餢 髼 uN O 璬 bravely N 餢 髼 bravely and u exuvi...
第一章 声现象 基础知识 回声测(The first chapter is the basic knowledge of acoustic phenomena)
第一章 声现象 基础知识 回声测(The first chapter is the basic knowledge of acoustic phenomena) 第一章 声现象 基础知识 回声测(The first chapter is the basic knowledge of acoustic phenomena) ? {N Hao 餢 皊 a? 鹡 @ x 鍂 Xue 轛 餢 Km 輱 粂 2 s = vt , {N 倐 餢 髼 uN O 璬 bravely N 餢 髼 bravely and u exuviate 筽 Xu IN 1 餢 / f1uirSO/c bravely ? u bravely 2 / c ? sayin hammer 裇 餢 亯 筽 1 NR 裇 餢 irSO bravely and recess (W/c ? 2 餢 髼 / f1uirSO/c bravely ? u bravely ? 3 裇 餢 irSO bravely/c \ Pbk 裇 餢 _N \ Pbk0 憉 筽 1 NRck (W 裇 餢 irSO bravely and recess (W/c ? Liu SO hide SO lSO recess sayin hammer Qi/c ? euro u 餢 髼 0 2 / c ? \ Pbk 裇 餢 _N \ Pbk NT 嶯 / c ? \ Pbk 裇 餢 _N Ban ? \ 1 0 y/c Pbk 闟 / f N dozens 裇 餢 FO/f 烻 eg @ b 裇 crane 餢 bravely 髼 貜 OX [(Wv ^ e ? ? ? 韣 TY 孨 餢 髼 bravely and O 璬 exuviate 筽 Xu IN 1 餢 bravely and O 璬 梺 壦 N (? 2 餢 hammer 钑 b__ bravely O 璬 purchase 蛓 钑 with 餢 钑 0 亯 筽 1 齹 Y O 璬 餢 髼 bravely and ir (Mr SZP qiang (? 2 餢 髼 bravely and qiang (? G Liu SO lSO hide SO 3 WZZ N 齹 O 餢 Exuviate 筽 餢 髼 hammer 钑 b__TY O 璬 0 Qi: bravely NirSO/c bravely ? irSO $N bravely and never zzl1 \ b_b who his 弖 鴙 魰 钑 bravely ? 軓 Y T O 璬 purchase 1 \ / f 餢 钑 N 餢 悓 T 轛 餢 Shedding 筽 Xu IN 餢 O 璬 隷 bravely and ba (u 餢 Bi c 饛 僛 'Y \ {I bravely 嶯 餢 (W Xi Dai Gui O 璬 輱 bravely 粂 0 餢 悇 v' Y \ 邖 qiang (崉 v 蛓 {| gsQ 貜 邖 qiang (崉 v) n gsQ0 亯 筽 1 餢 髼 (WUSMO Quan 魰 Gui O 璬 輱 bravely 粂 with ZP 餢? 2 餢? N qiang (崉 v 蛓 {| gsQ0N,? W Liu SO 璬 g - N O 隷 vQ! K/f cheating SO (WlSO - N O 璬 gba 3 餢? N 倐 bravely and 6 r) N gsQ0N,? WlSO -n ) N 妽 lean 餢 悐 Mr _ 4 餢 髼 (W O 璬 Zi z -n I 0 r 湒 峹 irT 珗 蚐 \ 轛 eg e selections such 霳 齹 YN 烻 u: SR_ purchased 7 h 蚐 \ 轛 eg 餢 bravely 钑 \ 1 / f Shedding 筽 餢 髼 (W15! ZZL - N O bravely bravely 璬 惁 ^ / f340m/s) U \ 1 R ? 烻 餢 N 轛 餢 bravely and ag mud carp ` $轛 GS0R slow e selections such 3 euro Quan bravely 魰 詋 烻 餢 Zf0. N A $餢 恘 輱 粂 湒 峹 ir 髞 \ g17m 軓 2 轛 餢 bravely \ O (u ` $燫 : _ 烻 餢 A $轛 餢 Xu MO B $轛 餢 Km 輱 3 轛 餢 Km 輱 粂 2 s = vt B, {孨 倐 霳 ` 7 h, T0R 餢 髼 N ` 7 h, T0R 餢 髼 Shedding 筽 Xu IN (W 餢 髼 愘 ~ O 'Y 亜 vte Zi z - N * N Yue UO 裇 钀 R u 湒 峹 e selections such niche O1Y 籗, T Diao fo / 0 f 俌 済 闟 sticking/O f 湒 峹 euro Sha 齹 Y 骮 who splashed 惽 弙 Q 僛 悇 _ \ Quan R O T Diao ^ y 蟸 e selections such _N 齹 Ya 亯 筽 1 e selections such 3 euro bravely Y3 euro 3 euro view Y3 euro S? - N3 euro warm? 3 euro , T \ Gui JS 膲 MR ji 3 euros? 2, T0R 餢 髼 悇 bravely _ ? irSO/c? Qiang (Ling! Warm? B4Y ?, T Diao ^ y 蟸? u, T Diao e | ? ? 筽 俌 済 O sticking 餢 髼 bravely and warm 亴 T, T \ 裇 u_c $ 1 \ • O, O O T 汻 sticking with ZP O '` 3 euro K euro FO 貜 sayin hammer 惽 弙 Q 僛 悇 ? _ \ / c O zhang, T Diao ^ y 蟸 e selections such sayin hammer e ? ? ? 韣, T0R 餢 髼 , T Diao -n bN, T Diao gsQ bravely and ^ y 蟸 qiaocheng 0 r_c 砙 , T 汻 OM'd u 髞 / O f 'N1Y with ZP ^ y 蟸' ` 3 euro euro N, K? N sayin Yue nought. ) U \ , T0R 餢 髼 bravely and ag mud carp ` $, the T Diao alkali ck8 ^ A $irSO/c bravely ? 憳 噑 slow 0 r e selections such 3 euro, bravely and T Diao B $餢 硩 髼 g Y Qi bravely C $g O 璬 qiang bravely (? Sticking 孨 O 孴 蘏 3 euro He ? Shedding 筽 Xu IN 餢 髼 惽? Y 寴 _N 齹 • z0R, T Diao ^ Y 蟸 _w? T 褃 Diao 0 f [-n Duo 餢 髼 bravely and purchase 蛓 O sticking 筫 _ with ZP O sticking Sticking 亯 筽 O 悇 bravely _ ? irSO/c? 餢 钑? 4 b y 寴 ? T Diao ^ y 蟸 Shedding 筽 蘏 3 euro He ? u ag bravely and mud carp ` $鵞 TN * N 餢 髼 $N 闟 3 euro 5 ga qiaocheng 0 r bravely: _ 'Y \ NT A $鵞 TN * N 餢 髼 $N 闟 3 euro 5 ga qiaocheng 0 r Quan bravely 魰 HQT NT B $鵞 TN * N 餢 髼 $N 闟 3 euro 5 ga qiaocheng 0 r/c bravely ? ek 宊 N NT , {N 倐 餢 髼 bravely and yr '` N 髼? Shedding 筽 Xu IN 1 irSO/c ? 隷 bravely 裇 crane 髼 bravely? \ lean / c ? bravely and ba 裇 crane 髼 bravely? \ NO 2 Xi Dai Gui irSO/c ? bravely! Matter 憳 噑 egh? YirSO/c ? 隷 bravely ba0 憳 噑 Fu Xu 餢 髼 髼 bravely? 0 憳 噑 USMO bravely/fk1 - fk 峺 Q euro {饄 k? & {鱏 : NHz 3 憳 噑 lean 嶯 20000 hz 餢 bravely 髼 : N through 餢 钑 NO 嶯 20 hz 餢 bravely 髼 : N! K 餢 钑 憉 筽 1 髼? Fc 餢 髼 bravely and poverty is NO _N1 \ / fs ^ ^ 8 b 霳 e ? ? ? 餢 bravely 髼 bravely N/f 餢 髼 bravely and 'Y \ _N N/f 餢 髼 髼 bravely and r? 0 2 (W 鴙 T bravely and qiang (Zu T) n -n 憳 噑 NT 餢 bravely 髼 O 璬 惁 ^ 鴙 T0 Poor NON) U \ 髼 寗 v e ? ? + HN g Poverty is NO 髼 寗 v 邖 裇 餢 SO bravely and b_ 秗 : \ ? 孴 @ b (u Pg 檈 '` bravely bravely (岻 {Y 蛓 Qi} gsQ0 孨 Qi Shedding 筽 Xu IN 1 餢 髼 bravely: _1_ 'Y \ with ZP Qi 2 irtf [-n (u/cE ^ eg e ? ? ? 饛 ? irSO/c E ^ bravely 0 irSO/cE ^ bravely 妽 'Y u 餢 髼 Qi bravely 妽 亯 筽 1 irtf [-n Qi c 餢 髼 bravely: _1_ u; m - Nc e selections such 3 euro a qiaocheng 0 r 餢 bravely 髼 bravely and ' 2 e selections such 3 euros a qiaocheng 0 r irSO Qi bravely bravely N 輱 粂 裇 餢 SO bravely 軓 his g Shedding 筽 1 Qi N 餢 恘 / cE ^ bravely gsQ / cE ^ 妽 'Y Qi 妽' Y N e selections such 0 r 餢 恘 輱 bravely 粂 gsQ 輱 粂 妽 'Y Qi 2 髼 寣 T Qi / f9h, g NT $N * Nyr 'bravely ` 雓 鄀 sQ alkali 0 N 髼 r? Shedding 筽 Xu IN 1 憳 噑 bravely and poverty is NO Fu Xu 餢 髼 髼 bravely? / cE ^ bravely and 'Y \ Fu Xu 餢 髼 Qi bravely 0 2 NT 裇 餢 SO bravely and Pg 檈 Yi 刧 NT 裇 crane 餢 髼 髼 r 俖 N1 \ bravely NT0 亯 筽 髼 r? Fc 餢 髼 bravely alone (? sS 髼 (? 0 ) U \ e selections such bravely O 彇 t ^ 劅 瀀 bravely •? hammer 蔛 n 欉? eP 穅 Qi} euro feng S0 bravely; 暭 hammer 軴 cO p sayin? Bravely 髼 r? 0 , {踁 倐 jV 餢 bravely and qS 砙 孴 6 r N jV 餢 bravely and eg 恘 Shedding 筽 Xu IN 1 Fei irt 覊 eg e ? ? ? jV 餢 / f 裇 餢 SO \ O 鄀 膲 R/c ? Quan 裇 crane 餢 bravely 髼 Fei Ji 軴 覊 eg e ? ? ? 酫 / f ? 峹 e selections such 霳 ck8 ^ Oo ` f [` N 孴 graphic \ O 餢 bravely 髼 hammer 蔛 鵞 e selections such 霳 亯, T bravely 餢 髼 ur ^ pb 2 the jV 餢 钑 bravely b_ 鄀 膲 媉 NBgqN0 e | ? ? 筽 PN 髼 孴 jV 餢 bravely and 9 h, g, S + R (W 嶯 PN 髼 / f1u 裇 餢 SO 膲 R/c ? u bravely and 钑 b_ 膲 R/f bravely and jV 餢 / f1u 裇 N 膲 R/c ? u bravely and 钑 b_BgqN 鄀 Hao 0 孨 jV 餢 bravely and I { bravely and RR Shedding 筽 Xu IN 1 e selections such 霳 & {鱏 / fdB : NUSMOegh? Y 餢 髼 : _1_ bravely and I { 0 e selections such bravely, T Diao/f20Hz - 20000 0 db e selections such R 齹, T0Rg 甠 1 _ bravely 30 to 40 db 儚 : Nt 骮 塠 棷 Y s 僗 bravely : never N who 軴 翄 Oo ` 孴 aw w 餢 髼 N 齹 calendar Zi 50 db : never N who 軴 翄 孴 graphic \ O f [` N 餢 髼 N Zi 齹 calendar 70 db : never N who 軴 , T 汻 餢 髼 N 齹 calendar Zi 90 db 0 2 餢 髼 Fei u0R_w? T Diao bravely and N * N6 柕 k ` $餢 恘 / c bravely ? u 餢 髼 A $zzlI {qiang (崉 v O 璬 B $warm 亜 ? 0 v/c ) U \ jV 餢 bravely and qS 砙 sayin R: N Hui 郠 {| R: kai X bravely and qS 砙 sayin NutqS 砙 Ba 虘 qS 砙 孴 irtqS 砙 0 N * Y: _ bravely and jV 餢 • O e selections such a0R 孲 e ? + ? 詋 儚 : _ bravely and jV 餢 • O e selections such a0R: R3 euro e | ? ? qiaocheng Quan 魰 never EN who O_w Jiao V 餢 '` NP? Poor @ Hou SGS Ban S {No bureau 莡 秗 Fu: _ bravely and jV 餢 郠 R 煍 Quan 魰 1 \ O • O e selections such 4 yuf v ` Ba UTT Yin U O bravely and 乬 : _ bravely and jV 餢 貜 Oq_ Qi 蝷? Q 裇 bravely and eyelid ? 峹? Q 鍅 bravely and zf 汻 裇 U \ U 髞 / f 魐 ? B e selections such 孴 ? ir {bravely N 6 RJV 餢 Shedding 筽 Xu IN 6 RJV 餢 bravely and N * N 筫 b? ` $2 朾 kjV 餢 u A, $. 柇 ejV 餢 bravely and O 璬 B $2 朾 kjV 餢 wade eQ3 euro 5 g 亯 筽 Ban 餢 Fei 餢 恘 crane 8 t 餢 (W O 璬 Zi z -n 螀 1 _ 敄 餢 (W e selections such 3 euro 螀 1 Y , {擭 倐 餢 bravely) R (u N 餢 N 酧 o ` 亯 筽 1 轛 餢 Xu MO 2 餢 Qiao Km 輱 Km | 湦 • 憉 筽 餢 俰 bravely 鮛 詋 儚 • ^ S 靊 calendar 餢 ! I {k 餢 餢 髼 Rc e selections such euro 齹 Ya qiaocheng 0 r 餢 exuviate bravely 筽 餢 hammer O 愥 髼 sayin e | ? ? 筽 (u through 餢 钑 sayin hammer 芉 nx0W 穬 梍 e selections such as Gui 钀 緐 舥 酧 bravely o ` bought 1 \ B/f through 0 (u through 餢 钑 颣 錱 珟 SO Quan 1 u 嶯 e selections such SOT 钀 RhV NT ) R (u 梴 : g Yin > f: hammer nZi0W 緥 y y sayin \ e selections such SO Gui 钀 hV 榌 Yi bravely 刧 > f: y (settlement N 9 HNC Yin ; Su 坃 隷 hammer ~ 1 \ sayin b crane 舥 vp @ b (W MOn bravely and never • who through 餢 钑 錱 鵞 e selections such SO g $O 砙 0 NT 嶯 XIQ 孨 餢 N 齹 蠎 亯 筽 ? irSO bravely/c? u 餢 钑? \ 齹 蠎 O 籗 慂 Q? 餢 钑 齹 O Sao euro 蠎 Shedding 筽 through 餢 钑 sayin hammer (uegnm Xiang his bravely: g 癶 褃; Y Su sayin hammer) R (u through 餢 钑 / c ? d Zhi S e selections such SO Gui bravely , {孨 Hao IQ 皊 a? 1 鹡 @ x 鍂 Xue IQ 恘 陙 珟 齹 裇 IQ irSO0 bravely * Y3 Y? F 陙 6 qiq 恘 uop0 was killed 5 0 Q/f e selections such 怚 Q 恘 0 g 甆 孴 @ g bravely and b N/fIQ 恘 0 2 IQ (WT 蛓 GWS bravely and qiang (? N of taeniasis 魐 pale green O 璬 0 齹 銐 蕬 q_P [b_b bravely 孴 \ T [b Yin 0 3. WZZ -n bravely and IQ? F the noise 橻 - Ng 隷 惁 bravely ^ (uW [蚹 ch? Y c = 3? 108 m/s IQ (W4l -n 惁 bravely ^ / FWZZ -n bravely and 3/4 (W Nv 僼 - NIQ? Nwzz - N2/3 4 IQG? R4lb? Nv 僼 hammer 蔛 vQ 諲 Jiao YirSO h 坆 bravely and pass me? O 裇 u 蚐 \ 0 IQ 蚐 bravely \ u Hao [蚐 \ 膲 媉 0 1 蚐, pale green 0 IQ eq, IQ pale green 孴 who pale green (WTNs Lai Q ^ b 2 蚐, pale green 0 IQ eq, IQ pale green who RE \ $N pale green 3 蚐 \ 覊 I {嶯 eQ \ 覊 5 (W 蚐 \ 皊 a? N IQ molasses sayin? 0 蚐 : \ R \ N 昩 椡 S + o \ 孴 蚐 \ 0 \ \ 昩 椡 S h 坆 桰 Q experiences pale green eQ \ S ^ L 圛 Q 蚐 \ IQ pale green 貜 / fs ^ L 垊 where v0 + o 蚐 \ | quality h 坆 jujube pale green eQ \ s ^ L 圛 Q 蚐 \ IQ pale green T 踁 梜 Q 筫 0 b 6. IQ Fei N 蛓 qiang (崪 e \ eQ 鍿 N 蛓 qiang (嶖 e O 璬 筫 t-shirts uOP grain purchase 蛓 皊 a 岆 SIQ bravely and grain \ 0 裇 u grain \ Quan T Quan N Xu _N 裇 u 裇 grain \ \ 0 皊 a? NIQ molasses 悇 _N/f sayin where v0 7 IQ Fei ZZL 渆 \ eQ4lb euro vQ 僛 qiang (? N Quan grain \ IQ pale green T who pale green 筫 TOP grain 0 IQ bravely and grain \ Xu 媉 N pale green qQb? $N pale green R $N 覊 NI { ZZL -n 覊 'Y 汵 The grain \ 皊 a? {昅 O0 ` l4l feng Em04l -n 蒘 |? {0 wm ^ 噟 iI 8 N_g} vIQ * Y3 Tiao Q 惽? N 駂 \? R 銐 b: N Yj Er ~ e ? ? ? [?} Nr bureau Q 皊 bravely and a 岆 SZPIQ bravely and R 俢 e0 e ? ? N/fUSr bureau Q euro/fT 蛓 USr bureau Q 膥 bravely and b YTIQ0i_y? F * Y3 Tiao Q 珗 俢 4 l "r e euro b0 9 IQ bravely and N 烻 r? 0 ~ 0 e 湗 檈 N 烻 r? R? 0 Er 0 " ? FirSO 湗 bravely and r? G 惽 Quan [r bravely bureau Q Fu Xu N? FirSO 湗 bravely and r? U 僛 蚐 \ r bravely bureau Q Fu Xu 0 100 Y pale green MO 嶯 IQ hammer Y NRirSO recess (W N \ P0W 裇 \ Y pale green irSO) N 妽 lean 悘 \ bravely and pale green 1 Y \ 妽 Y irSO 悘 \ pale green T Y Quan _N (W8T6e pale green Y 0 pale green \ O Y (u ` $韕 \ O (u 燫 韕 邩 ir 韕 1 world V 蕥 舥 A $ Ye? A 0 wt 豏 Km0 luan ~ b4l 恘 0 裿 茐 maxillary soap KP ~ pI { B $e 惂 5 c u 茐 : g0zz margin {0 11 + +}} Y pale green MO 嶯 IQ hammer * Y Y3 Tiao Q/f) Y6q +} Y pale green bravely and decidual 亯 eg 恘 0 韥 'hammer t6e 8 +} Y l sayin pale green • 怣 Q Zi 蠎 +} Y bravely and pale green 鵞 e selections such SO $ +} Y pale green \ O (u ` $@ g 虄 ; Sb 杽 v +} Y pale green op A + $} Y pale green bravely and g 僆 QHe ? 灁 treasure: g02? O B $mission _ +} Y bravely and pale green gq \ g) R 嶯 e selections such SOTb fish u} D, 肙 wade 珟 SO 鵞 e | fell ? bravely and 8 t6e 鵞 e selections such SO fine u • 晫 teb 穅 YY0, g} {N Hao (1) -n 魰 歋 Bian • 剠 怽 bravely 曤 S sound 怽? Bian • 歋 -n 魰 剠 怽 bravely 曤 S 鵔 怽? 0 惽 anatomic Q Ba IQ bravely and pale green N9e feng O 璬 筫 T02. Sound 怽? G $N * N e ,1/2 level, & q 筽 & q 筽 0 riq Ba 輱 粂 with ZP&q 輱 0 G $N * NZ? Q 筽 0 3. Sound 怽 曺 [IQ pale green south east euro \ O (u 鵔 怽 曺 裇 ce \ [IQ pale green g O (u0 4. Nagyr 妅 IQ pale green ` $Zi IQ Ba IQ bravely and pale green N9e feng O 璬 筫 T0 A $s ^ L 垘 N; NIQt 弰 vIQ pale green 蟸 grain \ T Zi & q 筽 鵞 鵔 怽 昬 g e ? ? ? 僛 筽 & q/bravely Q 筽 / f grain \ IQ pale green 蚐 T bravely and therefore • nickname ~ Zi & q 筽 $Zi b & q 筽 IQ bravely and pale green 蟸 grain \ TN; NIQt Remus ^ L? 0 鵞 鵔 怽 昬 g e ? ? ? / Q 筽 / feQ \ IQ pale green ckT bravely and therefore • nickname ~ Zi & q 筽 05. Gq: g? Y/f * N sound 怽? ? Q Ji bravely \ O (u/f better Oregon? Y0R Wen Gr 輱 bravely 粂 蚥 his of Quan \? Y euro _MR8O 蚥 軓 of Quan \? Y euro _T) • IQW 6 r wade eQIQ bravely and Y \ 隷 钑 6 r 磃 IQ Quan 魰 0 6 u > 2 f P 藌) • \ e ,1/2 level, gq 鴙 U = 2 f P 藌 I {' Y e ,1/2 level F < u < 2 f P 藌 > e 'Y e ,1/2 level 昩 q U = f N b Yin U < f ck 藌 > e 'Y Z? > e 'Y \? N P&q 輱 RZ 啚 [ $N P&q 輱 R 'Y \ e ,1/2 level, PZ 哻 kegb Yin Yin bravely and' Y \ Yin 輱 Xu Q 邖 @ wir? Q Dan 0 7 < w/w} Ya? N 秅 gq 鴙 : g vf 秗 SO 鴙 S_ 嶯 sound 怽? 茐 Q • 渷 鴙 S_ 嶯 IQO \ 0 f 茐 輱 粂 : N25cm0 軓 茐 < w 齹 wn 軓 irSO bravely and euro Y w Nn his Y irSO bravely vf 秗 SO * Y 剠 Yin b (W 茐 Q • 渷 KNT his 茐 < W 齹 wn his euro W Y Nn 軓 Y irSO bravely vf 秗 SO * Y 歋 Yin b (W 茐 Q • 渷 闟 MR0 8 his 茐 < w ? 鍕 & ^ 鵔 怽? 軓 茐 < w ? 鍕 & ^ sound 怽? 0 < w \ Xi v PE = 100? & q & q = 1 / f9 G 軓 \ Xi v e ? ? ? \ 晫 Tir F sound 怽? e ? ? ? \ book vS_ 嶯 > e ' ir \ book vS_ 嶯 gq 鴙 : g \? Y0 > f 甠 \ Xi v e ? ? ? \ 晫 Tir \ 昣 N/f e ? ? ? \ book vS_ 嶯 > e ' ir \ book vS_ 嶯 昩 q_ 闚 \? Y0 , {踁 ` feng S Hao ir 1) n / firSO said bravely 韕 z 0 2) n 烻 t hide SO bravely 韕 lee said) • '` bravely? 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