_______ of the furniture in the museum ______ from Ming and Qing Dynasty.

A．Two-thirds; is

B．Two-thirds; are

C．Two-third; is

D．Two-third; are

避雷器泄漏电流带电检测对待测设备要求正确的是（）。

A.设备处于运行状态

B.设备外表面清洁

C.设备上无其它外部作业

D.设备处于检修状态