“直客式”营销模式已成为银行近年来个人贷款业务长足发展的有力“助推器”。

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