定时器产生的脉冲要同时送到（）。A、发射机 B、接收机 C、显

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问题单项选择题

定时器产生的脉冲要同时送到（）。

A、发射机

B、接收机

C、显示器

D、以上都是

答案

参考答案：C

单项选择题

Many students agreed to come, but some students against because they said they don't have time.

A．were against because they said they did not

B．were against because they say they don't

C．were against it because they said they did not

D．were against coming because they said they don't

判断题

电动现象的存在，说明了胶粒表面总带有正电荷。