单项选择题
Which of the following forms of energy is demonstrated through the process of combustion?（）
A.Chemical energy
B.Mechanical energy
C.Thermal energy
D.Electrical energy
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While inspecting the steering system at sea, you should check for （）.
A.air bubbles in the sight glass
B.any leaks in the system
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D.lost motion in the rams -
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Excessive air leakage into the suction side of a centrifugal pump would be indicated by which of the following operational problems?（）
A.The pump delivers full capacity when started, but gradually slackens off toan abnormally low flow
B.The pump packing gland overheats after short operating periods
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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 （）.
A.diameter of the discharge piping, with all other factors remaining the same
B.diameter of the suction piping, with all other factors remaining the same
C.width of the impeller only
D.diameter of the impeller
