低压架空线路的故障主要有()和设备电气性故障两方面。
参考答案:外力机械性破坏
—Does he want to see a movie?
—_____. [ ]
A. Yes, he is
B. He doesn't know
C . You are welcome
D. No, he doesn't
收入能够导致企业所有者权益增加,但导致所有者权益增加的不一定都是收入。 ( )