单项选择题

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 circulation

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单项选择题

Load control on a diesel engine is accomplished by （）.

A.regulating the speed of the turbocharger
B.rotating the fuel injector pump plunger
C.regulating the speed of the fuel oil transfer pump
D.changing engine timing

单项选择题

When reassembling the bowl of a disk-type centrifuge, the bowl or locking ring is rotated （）.

A.clockwise, due to the bowl rotating clockwise
B.clockwise, due to the bowl rotating counterclockwise
C.counterclockwise, due to the bowl rotating clockwise
D.counterclockwise, due to the bowl rotating counterclockwise