单项选择题 While inspecting the steering system at sea, you should check for （）.

单项选择题 Excessive air leakage into the suction side of a centrifugal pump would be indicated by which of the following operational problems?（）

单项选择题 Increasing the speed of a centrifugal pump will result in an increase in its capacity Another means of increasing the capacity of a centrifugal pump is to increase the （）.