They have demanded that all the facts______ known to the public.

A．make

B．are made

C．be made

D．should make

发动机外排系统作用是（）。

A.防止溢出的液体接触发动机高温区域

B.利用溢出口判定失效部件

C.A、、B都对

D.以上都不对