在交流电路中，电感元件两端的电压在相位上比电流（）
A.超前90°
B.滞后90°
C.超前180°
参考答案：A
I have no idea whether he has sisters, and if he does, _____？[ ]
A. how many sisters does he have
B. he has how many sisters
C. how many he has sisters
D. how many sisters he has
某土石方工程实行混合计价。其中土方工程实行总价包干，包干价14万元；石方工程实行单价合同。该工程有关工程量和价格资料如下表。则该工程结算价款为（）万元。
A.47.6
B.48.3
C.50.0
D.50.7
