单项选择题
A.increase speed
B.increase the size of the cardent assembly
C.reduce wearing ring clearances
D.change the pump to a "close coupled" arrangement
单项选择题 Which of the following forms of energy is demonstrated through the process of combustion?（）
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?（）