In order to increase the wearing resistance, the cylinder li

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[单选题]In order to increase the wearing resistance, the cylinder liner surfaces are sometimes （）.

A. aluminum-plated
B. bronze-plated
C. zinc-plated
D. chromium-plated

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[单选题]Main bearings are required to support the crankshaft at each （）.

A. end
B. web
C. pin
D. journal

[单选题]The two-stroke cycle begins with the piston coming up from the bottom of its stroke, with scavenge ports in the sides of the cylinder being （）.

A. shut
B. closing
C. opened
D. closed

[单选题]A three-way thermostatic control valve regulates the diesel engine cooling water temperature by passing a portion of the water （）.

A. around the engine
B. around the cooler
C. to the expansion tank
D. overboard

[单选题]Auxiliary boilers are divided into several classifications, one of which is （）.

A. water-tube supercritical circulation
B. water-tube forced circulation
C. fire-tube controlled circulation
D. fire-tube express circulatio

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