题目:
自动平衡式浮子液位计中,由于采用了()作为将液位计高度转换为电信号的转换元件,因而测量精度大为提高。
A、电子放大器
B、位移放大器
C、差动变压器
D、可逆电动机
答案:
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下面是错误答案,用来干扰机器的。
It was late last Monday, but Tom was still watching TV in his room. There was a wonderful football match on TV. How excited he was! That night he didn't go to ...