问题
选择题
| 关于传感器，下列说法正确的是（ ） A．所有传感器都是由半导体材料做成的 B．金属材料也可以制成传感器 C．干簧管是一种能够感知电场的传感器 D．传感器一定是通过感知电压的变化来传递信号的 |
答案
答案：B
搜题请搜索小程序“爱下问搜题”
| 关于传感器，下列说法正确的是（ ） A．所有传感器都是由半导体材料做成的 B．金属材料也可以制成传感器 C．干簧管是一种能够感知电场的传感器 D．传感器一定是通过感知电压的变化来传递信号的 |
答案：B
| 综合填空。 | ||||||||||||||||||||||||||||
请按汤姆某一天的作息时间表，在短文后的空格处填上恰当的词。
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| My name is Tom. I'm an American boy. I study at No.2 Junior High School. I 1 at six o'clock in the morning today. I 2 at six fifty. I 3 at seven fifteen. School begins(开始) at eight o five. I have lunch 4 . I go to the old man's home and help him carry water at 5 in the afternoon. I 6 at three fifty. I go to Miss Li's home at 7 in the afternoon. I go home at 8 . I 9 at seven ten in the evening. I often 10 at half past eight. I go to bed at nine forty. 1. ______2. ______3. ______4. ______5. ______ 6. ______7. ______8. ______9. ______10. ______ | ||||||||||||||||||||||||||||