| 1 |
00:00 447 |
| 2 |
00:00 410 |
| 3 |
00:00 385 |
| 4 |
00:00 323 |
| 5 |
00:00 327 |
| 6 |
00:00 380 |
| 7 |
00:00 361 |
| 8 |
00:00 361 |
| 9 |
00:00 358 |
| 10 |
00:00 352 |
| 11 |
00:00 339 |
| 12 |
00:00 336 |
| 13 |
00:00 343 |
| 14 |
00:00 331 |
| 15 |
00:00 337 |
| 16 |
00:00 325 |
| 17 |
00:00 371 |
| 18 |
00:00 317 |
| 19 |
00:00 309 |
| 20 |
00:00 336 |
| 21 |
00:00 316 |
| 22 |
00:00 329 |
| 23 |
00:00 363 |
| 24 |
00:00 368 |
| 25 |
00:00 322 |
| 26 |
00:00 329 |
| 27 |
00:00 346 |
| 28 |
00:00 372 |
| 29 |
00:00 377 |
| 30 |
00:00 350 |
| 31 |
00:00 412 |
| 32 |
00:00 305 |
| 33 |
00:00 274 |
| 34 |
00:00 340 |
| 35 |
00:00 334 |
| 36 |
00:00 311 |
| 37 |
00:00 461 |
| 38 |
00:00 386 |
| 39 |
00:00 502 |
| 40 |
00:00 330 |
| 41 |
00:00 336 |
| 42 |
00:00 396 |
| 43 |
00:00 371 |
| 44 |
00:00 356 |
| 45 |
00:00 317 |
| 46 |
00:00 315 |
| 47 |
00:00 301 |
| 48 |
00:00 322 |
| 49 |
00:00 366 |
| 50 |
00:00 318 |
| 51 |
00:00 325 |
| 52 |
00:00 354 |
| 53 |
00:00 323 |
| 54 |
00:00 289 |
| 55 |
00:00 307 |
| 56 |
00:00 285 |
| 57 |
00:00 338 |
| 58 |
00:00 554 |
| 59 |
00:00 627 |
| 60 |
00:00 314 |
| 61 |
00:00 665 |
| 62 |
00:00 302 |
| 63 |
00:00 276 |
| 64 |
00:00 432 |
| 65 |
00:00 288 |
| 66 |
00:00 301 |
| 67 |
00:00 269 |
| 68 |
00:00 289 |
| 69 |
00:00 380 |
| 70 |
00:00 300 |
| 71 |
00:00 296 |
| 72 |
00:00 286 |
| 73 |
00:00 311 |
| 74 |
00:00 315 |
| 75 |
00:00 291 |
| 76 |
00:00 322 |
| 77 |
00:00 277 |
| 78 |
00:00 287 |
| 79 |
00:00 350 |
| 80 |
00:00 308 |
| 81 |
00:00 272 |
| 82 |
00:00 290 |
| 83 |
00:00 280 |
| 84 |
00:00 301 |
超声波的基本知识(一)