The exhaust pipe must be gas tight throughout its entire length otherwise（）.

A.bilge water may enter the exhaust pipe

B.entry of air may cause vapor lock

C.carbon monoxide may enter the interior of the vessel

D.the joint gaskets may be blown

多冲旋转式压片机调节压力是调节

A．下冲头下降深度
B．上冲头下降深度
C．下压力盘高度
D．上下压力盘的高度
E．上、下冲头同时调节