绝缘棒平时应()。
A、放置平衡;
B、放在工具间,使它们不与地面和墙壁接触,以防受潮;
C、放在墙角;
D、放在经常操作设备的旁边。
参考答案:B
It was in the lab _____ was taken charge by Professor Wang ______ they did the experiment.
A.where, that
B.that, which
C.that, where
D.which, that
能够承受自船首方向的风、流推力和倒车的拉力,防止船位向后移动及外张的缆绳是:()
①、头缆;②、尾缆;③、前倒缆;④、尾倒缆;⑤、横缆
A.①、④
B.②、③
C.①、③、④
D.②、③、⑤