Don't ____ in the bathroom. [ ]
A. played
B. playing
C. play
C
鉴定矿物类中药的透明度时，应将矿物磨成的标准厚度是（）
A．0.03cra
B．0.03mm
C．0.03μm
D．0.03nm
E．0.03dm
简述更换220KV耐张杆塔双联单片绝缘子的具体操作步骤？
