单项选择题
A.water-tube supercritical circulation B.water-tube forced circulation C.fire-tube controlled circulation D.fire-tube express circulation
Load control on a diesel engine is accomplished by （）.A...
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
When reassembling the bowl of a disk-type centrifuge, t...
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
In diesel engines designed with a crosshead, the motion...
单项选择题In diesel engines designed with a crosshead, the motion of the piston rod can be described as （）.
A.reciprocating at the piston pin, rotary at the crank pin B.reciprocating at the crank pin, rotary at the piston pin C.straight reciprocation D.straight rotation
