熔断器在安装底座时,拧螺丝应小心,切勿用力过猛,以免损坏瓷件;插入熔体时()。
A、应先核对规格
B、应先隔离电源
C、应先检查线圈温升
D、应先检查熔丝管外观
参考答案:B
随机对照试验的基本原则是()
A.对照
B.随机
C.盲法
D.全面
The employee you had been thinking highly________dishonest.[ ]
A. of proving
B. of proved
C. of to prove
D. of being proved