单项选择题
A Kort nozzle is a(n)（）.
A.hollow tube surrounding the propeller used to improve thrust
B.nozzle attached to a firefighting hose
C.intake valve on a diesel engine
D.piston cylinder on a diesel engine
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相关考题
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单项选择题
A hydraulic accumulator aboard a ship is designed to（）.
A.store fluid under pressure
B.act as a fluid reservoir
C.provide overpressure relief
D.replenish fluid to a system -
单项选择题
A fuel-air mixture below the lower explosive limit is too（）.
A.rich to burn
B.lean to burn
C.cool to burn
D.dense to burn
