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
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相关考题
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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 -
单项选择题
Immediately after any diesel engine is started, the engineer should check the （）
A.crankcase pressure
B.lube oil pressure
C.saltwater pressure
D.exhaust temperature -
单项选择题
The rate of heat transfer in a water-tube auxiliary boiler can be increased by （）.
A.operating the boiler at less than normal water level
B.installing fins on the firesides of water-tubes
C.increasing the amount of excess air to the burners
D.treating the boiler water with chemical oxygen scavengers
