本课配套习题挑战模式1/5
单选题
难度系数:
1.在下列各种电器设备中,工作时与电磁波无关的是( )
A: 电冰箱 |
B: 微波炉 |
C: 移动电话 |
D: 电视机 |
一次做对,真牛!
+5奖励规则>
- 提示1:55S15Yaw566x5YaF5pyJ5Y6L57yp5py677yM5YW25a6e6LSo5piv5LiA5Liq55S15Yqo5py6
- 答案:QQ==
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
本课配套习题挑战模式2/5
单选题
难度系数:
2.
在车站和机场,都要对旅客行李进行安全检查.当行李随输送带进入检查机时,会自动接受X射线检测,如有违禁物品会被及时发现.X射线是一种( )
A: 光导纤维 |
B: 电磁波 |
C: 超声波 |
D: 次声波 |
一次做对,真牛!
+5奖励规则>
- 提示1:PHA+5LqG6Kej55S156OB5rOi55qE56eN57G7PC9wPg==
- 答案:Qg==
PHA+5Zyo6L2m56uZ5ZKM5py65Zy655qE5a6J5qOA5YWl5Y+j77yM6KaB55SoWOWwhOe6v+WvueaXheWuouihjOadjui/m+ihjOWuieWFqOajgOafpe+8jOWunumZheS4iljlsITnur/lsLHmmK/kuIDnp43nlLXno4Hms6LvvI7mlYXpgIlC77yOPC9wPg==
本课配套习题挑战模式5/5
单选题
难度系数:
5.关于电磁波,下列说法正确的是( )
A: 电磁波的传播速度比光速小 |
B: 波长越长的电磁波频率越高 |
C: 所有的电磁波时刻都在危害着我们的健康 |
D: 电磁波是一种信息运载工具 |
一次做对,真牛!
+5奖励规则>
- 提示1:5LqG6Kej55S156OB5rOi5Zyo55Sf5rS75Lit5bqU55So
- 答案:RA==
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