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（）.

The pump discharge pressure will be considerably higher...

单项选择题The pump discharge pressure will be considerably higher than the pressure at the （）.

简述膜试漏的操作步骤。

问答题简述膜试漏的操作步骤。

焦炉最高开工率为128％，这是由（）决定的。A.干熄焦能力B.移动机械的周转时间C.焦炉硅砖允许的温度极限

单项选择题焦炉最高开工率为128％，这是由（）决定的。