施工现场自备发电机组应采用独立设置的TN-S接零保护系统。
参考答案：对
滑动支架安装时应灵活，滑托与滑槽两侧间应留有( )mm的间隙。
A．1～2B．2～3C．3～5D．5～7
The affluent middle class created by the Asian boom now take up over from exports as the main engine of growth.
A．take over from exports
B．take from exports
C．take exports
D．takes exports
