单项选择题
Upon underwater detection，there were no apparent defects on the bottom plates，bilge keels，rudder and propeller of the said vessel.This kind of wording usually appeared on（）.
A.ship surveyor's report B.a ship's certificate C.a cargo inspection report D.a diver survey report
单项选择题 The pump discharge pressure will be considerably higher than the pressure at the （）.
问答题 简述膜试漏的操作步骤。
单项选择题 焦炉最高开工率为128％，这是由（）决定的。
