It is politely _____ by the hotel management that loud music _____ after 11 o'clock at night. [ ]

A. requested; were not played

B. asked; not to play

C. requested; not be played

D. asked; did not play

绝缘斗臂车的接地属于（）。

A.系统接地

B.保护接地

C.防雷接地

D.工作接地