单项选择题

A.hollow tube surrounding the propeller used to improve……

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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热门试题

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