Mr. Black, there’s a man in _______ meeting room who says he has _______ news for you.

A．the; /

B．the; the

C．a; /

D．a; the

货物列车制动机安定试验的减压量一般为（）。

A.60kPa

B.100kPa

C.40kPa

D.180kPa