---May I have a talk with you on the phone, Sir?

--- ________,  but not during my sleeping time.

A．I'm sorry

B．Anytime

C．Certainly

D．Go ahead

有的制冷压缩机滑油分离器自动回油管上装有孔板其作用是（）。

A.过滤杂质

B.控制回油量

C.减轻浮球控制针阀磨损

D.A+B+C