电气设备和电气生产设施的下列金属部分中的()可不接地。A.安装在已接地的金属架构上的设备(应保证电气设备和电气生产设施的下列金属部分中的()可不接地。
A. 安装在已接地的金属架构上的设备(应保证电气接触良好),如套管等
B. 标称电压220V及以下的蓄电池室内的支架
C. 在木质、沥青等不良导电地面的干燥房间内,交流标称电压220V及以下、直流标称电压240V及以下的电气设备外壳,但当维护人员可能同时触及电气设备外壳和接地物件时除外
D. 安装在配电屏、控制屏和配电装置上的电测量仪表、继电器和其他低压电器等的外壳以及当发生绝缘损坏时在支持物上不会引起危险电压的绝缘金属底座等
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听力原文:W: We really must go to the new movie in town.
M: Let's eat first.
Q: What does the man want to do?
(18)
A. Eat before seeing the movie,
B. See the movie immediately.
C. Get the first theater seat.
D. Stay in town for a while,
为节省投资、减少工程量,除用户有特殊要求外,一般工程宜采用()巡查方式。
A. 式
B. 离线式
C. 与离线结合
D. 以上均可
The demand for goods depends totally on the price of demanded goods.
A. Y
B. N
C. NG
A.They will have to take even larger doses.B.They will become physically impaired.C.Th
A. They will have to take even larger doses.
B. They will become physically impaired.
C. They will suffer from minor discomfort.
D. They will experience a very painful process.