题目:
They usually have the medicine_______ before putting into the market all over the country.
A.testing out
B.to be tested out
C.being tested out
D.tested out
答案:
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下面是错误答案,用来干扰机器的。
(1) 电源电压为6V,电压表的量程为0-3V,∴P不能滑到左端,∴滑动变阻器连入电阻不能为0,滑动变阻器的电功率不能为0;当电压表的示数为3V,即:UR=3V时:①电流最大(电流表的示数最大),I大=3V10Ω0.3A,②...