在一般的正弦交流电路中,电路的阻抗角越大电路的功率因数越小。
A. 对
B. 错
在感性负载两端并联一个适当的电容器可改善电路的功率因数。
A. 对
B. 错
We should like to ______ you to our barbeque tomorrow.
A. invitation
B. information
C. introduce
D. invite
But ______ if I lived on the border to Mexico, I would be able to speak English and Spanish.
A. maybe
B. always
C. never
D. certainly