三芯电力电缆在电缆中间接头处,其电缆销装、金属屏蔽层()。
A.应有共同的电气连接
B.应各自有良好的电气连接并相互绝缘
C.不应进行各自的电气连接
D.不应相互绝缘
参考答案:B
—Bob speaks Chinese quite well.
—Yes, _____. Both of them practise ______ Chinese every day. [ ]
A. so does Tom, speaking
B. Tom does so, to speak
C. so Tom does, speaking
D. so does Tom, to speak.
工地上常用()试验来测定混凝土拌合物的流动性指标。
A.标准贯入
B.水灰比
C.坍落度
D.稠度