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[主观题]

The reason why more and more of the large merchant vessels are being powered by medium-spe

ed diesel engines is .

A.they operate between 150 and 450 rpm

B.they are connected to the propeller by gearing

C.their smaller size and weight

D.they can be connected directly to the propeller without gearing

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更多“The reason why more and more o…”相关的问题

第1题

The SMS should provide for specific measures aimed at promoting the of equipment or systems, the sudden operational failure of which may result in hazardous situations.

A.visibility

B.ability

C.reliability

D.capability

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第2题

The desirable properties of a marine fuel oil should include .

A.high flash point and high viscosity

B.low flash point and high viscosity

C.low heating value and high sulphur content

D.high heating value and low sulphur content

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第3题

The plunger in a jerk pump is rotated until the release port is uncovered If the port remains uncovered all of the time, which of the listed operations will occur?

A.No fuel will be delivered

B.The maximum effective stroke will be attained

C.The fuel delivered to the cylinder will be excessive

D.The injection nozzle will overheat and carbonize

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第4题

In an engine with a pot-shaped piston, some lubricating oil from the main bearing will pass along a drilled passage in the crankshaft to the bottom end bearing and then up a connection rod to the

A.crosshead

B.crankpin

C.crank journal

D.gudgeon pin

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