我国海军经过半个多世纪的建设与发展，现已具备远洋作战能力。
参考答案：错
I'll tell Mary about the news as soon as she _____ back. [ ]
A. is coming
B. comes
C. came
D. will come
电流通过导体时使导体发热的现象叫电流的（）效应。
A、物理
B、化学
C、机械
D、热
