中学生网络课堂本课配套习题挑战模式1/5
刚竣工的三峡大坝经过超声波检测，无一结构性裂缝。超声波探伤仪发出超声波时，人耳不能察觉，原因是超声波（ ）
| A: 速度太快 |
| B: 响度太小 |
| C: 频率太高 |
| D: 频率太低 |
- 提示1：PHA+5q2j5bi45Lq66ICz5ZCs5Yiw55qE5aOw6Z+z6aKR546H6IyD5Zu05Li6MjBIei0yMDAwMEh6PC9wPg==
- 提示2：PHA+6LaF5aOw5rOi55qE6aKR546H5aSn5LqOMjAwMDBIeu+8jOi2hei/h+S6uuiAs+WQrOinieiMg+WbtDwvcD4=
- 答案：Qw==
PGRpdj7otoXlo7Dms6LnmoTpopHnjoflpKfkuo4yMDAwMEh677yM6LaF6L+H5Lq66ICz5ZCs6KeJ6IyD5Zu077yMQ+mAiemhueato+ehrjxicj48L2Rpdj4=
本课配套习题挑战模式2/5
下面关于超声波和次声波的说法，正确的是（ ）
| A: 人们听不到次声波，是因为次声波的响度太小 |
| B: 次声波的传播速度小于声波的传播速度 |
| C: 利用次声波可以对地震和台风等自然灾害作出预报 |
| D: 次声波就是没有传播介质使人听不到的声音 |
- 提示1：PHA+5qyh5aOw5rOi55qE6aKR546H5bCP5LqOMjBIeu+8jOi2heWHuuS6huS6uuiAs+eahOWQrOinieiMg+WbtO+8jOaJgOS7peS6uuiAs+WQrOS4jeWIsDxicj48L3A+
- 提示2：PHA+5qyh5aOw5rOi5Lmf5piv5aOw5rOiPGJyPjwvcD4=
- 提示3：PHA+5Yip55So5qyh5aOw5rOi5Y+v5Lul5a+55Zyw6ZyH5ZKM5Y+w6aOO562J6Ieq54S254G+5a6z5L2c5Ye66aKE5oqlPGJyPjwvcD4=
- 答案：Qw==
PHA+5Lq65Lus5ZCs5LiN5Yiw5qyh5aOw5rOi77yM5piv5Zug5Li65qyh5aOw5rOi55qE6aKR546H5aSq5bCP77yM77yh6YCJ6aG56ZSZ6K+v77yb5qyh5aOw5rOi5Lmf5piv5aOw5rOi77yM77yi6YCJ6aG56ZSZ6K+v77yb5Yip55So5qyh5aOw5rOi5Y+v5Lul5a+55Zyw6ZyH5ZKM5Y+w6aOO562J6Ieq54S254G+5a6z5L2c5Ye66aKE5oql77yM77yj6YCJ6aG55q2j56Gu77yb5qyh5aOw5rOi5piv6aKR546H5bCP5LqOMjBIeueahOWjsOazou+8jOecn+epuuS4jeiDveS8oOWjsO+8jETpgInpobnplJnor688YnI+PC9wPg==
本课配套习题挑战模式3/5
下面关于超声波和次声波，说法不正确的是（ ）
| A: 蝙蝠能发出超声波 |
| B: 蝴蝶翅膀振动发出的声音是次声波 |
| C: 我们听不到超声波和次声波，是因为他们超出了人耳的听觉范围 |
| D: 超声波和次声波对于动物同样适用 |
- 提示1：PHA+6J2Z6J2g6IO95Y+R5Ye66LaF5aOw5rOi77yM6J206J2257+F6IaA5oyv5Yqo5Y+R5Ye655qE5aOw6Z+z5piv5qyh5aOw5rOiPGJyPjwvcD4=
- 提示2：PHA+5oiR5Lus5ZCs5LiN5Yiw6LaF5aOw5rOi5ZKM5qyh5aOw5rOi77yM5piv5Zug5Li65LuW5Lus6LaF5Ye65LqG5Lq66ICz55qE5ZCs6KeJ6IyD5Zu077yM5omA5Lul6LaF5aOw5rOi5ZKM5qyh5aOw5rOi5piv55u45a+55LqO5Lq66ICz6ICM6KiA55qEPGJyPjwvcD4=
- 答案：RA==
PGRpdj7onZnonaDlj5Hlh7rnmoTmmK/otoXov4cyMDAwMEh655qE6LaF5aOw5rOi77yM5Lq66ICz5peg5rOV5ZCs5Yiw77yM6YCJ6aG5QeivtOazleato+ehru+8jOS9huS4jeespuWQiOmimOaEj++8m+idtOidtue/heiGgOaMr+WKqOWPkeWHuueahOWjsOmfs+aYr+asoeWjsOazou+8jOivtOazleato+ehru+8jOWQjOagt+S4jeespuWQiOmimOaEj++8m+aIkeS7rOWQrOS4jeWIsOi2heWjsOazouWSjOasoeWjsOazou+8jOaYr+WboOS4uuS7luS7rOi2heWHuuS6huS6uuiAs+eahOWQrOinieiMg+WbtO+8jEPpgInpobnkuI3nrKblkIjpopjmhI/vvJvotoXlo7Dms6LlkozmrKHlo7Dms6Llj6rmmK/nm7jlr7nkuo7kurrogLPogIzoqIDvvIzlr7nkuo7liqjniankuI3pgILnlKjvvIzor7Tms5XplJnor6/vvIzkvYbnrKblkIjpopjmhI/vvIzliJnpgInmi6lE6YCJ6aG5PGJyPjwvZGl2Pg==
本课配套习题挑战模式4/5
以下关于超声波说法正确的是（ ）
| A: 超声波的振幅比较大 |
| B: 超声波可以越过一定厚度的真空向前传播 |
| C: 在同种介质中，次声波的传播速度比超声波小 |
| D: 人类听不到超声波，对于有些动物而言，可能是“可听声” |
- 提示1：PHA+6LaF5aOw5rOi5piv5oyH6aKR546H5aSn5LqOMjAwMDBIeueahOWjsOazojwvcD4=
- 提示2：PHA+55yf56m65LiN6IO95Lyg5aOwPC9wPg==
- 提示3：PHA+6LaF5aOw5rOi5LiO5qyh5aOw5rOi6YO95piv5aOw5rOi77yM5ZCM56eN5LuL6LSo77yM5Lyg5pKt6YCf5bqm55u45ZCMPC9wPg==
- 答案：RA==
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
本课配套习题挑战模式5/5
关于超声波和次声波下列说法正确的是（ ）
| A: 超声波就是速度超过340m/s的声音 |
| B: 超声波在水中的速度比在空气中大 |
| C: 次声波就是没有传播介质使人听不到的声音 |
| D: 超声波可以透过一定厚度的真空向前传播 |
- 提示1：PHA+6LaF5aOw5rOi5piv6aKR546H5aSn5LqOMjAwMDBIeueahOWjsOazojxicj48L3A+
- 提示2：PHA+5aOw5rOi5Zyo5LuL6LSo5Lit5Lyg5pKt55qE6YCf5bqm5YWz57O75piv5Zu65L2TJmd0O+a2suS9kyZndDvmsJTkvZM8YnI+PC9wPg==
- 提示3：PHA+55yf56m65LiN6IO95Lyg5aOwPGJyPjwvcD4=
- 答案：Qg==
PHA+6LaF5aOw5rOi5ZKM5qyh5aOw5rOi6YO95bGe5LqO5aOw5rOi77yM6aKR546H5aSn5LqOMjAwMDBIeueahOazouWPq+i2heWjsOazou+8jOmikeeOh+Wwj+S6jjIwSHrnmoTlo7Dms6Llj6vmrKHlo7Dms6LvvIxB44CBQ+mAiemhuemUmeivr++8m+WjsOazouWcqOS7i+i0qOS4reS8oOaSreeahOmAn+W6puWFs+ezu+aYr+WbuuS9kyZndDvmtrLkvZMmZ3Q75rCU5L2T77yM5omA5LulQumAiemhueato+ehru+8m+ecn+epuuS4jeiDveS8oOWjsO+8jETpgInpobnplJnor688YnI+PC9wPg==
