交流电路中,电容上电压相位与电流相位关系是电压相位超前电流相位180°。
参考答案:错
—What would you do if you _ _ the exam?
—I'd not tell my parents. [ ]
A. passed
B. failed
C. took
从工作面垂直煤壁打钻孔注水的方式称为()。