单项选择题

The reason why more and more of the large merchant vessels are being powered by medium-speed 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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单项选择题

The diesel engine is similar to the gasoline engine in that （）.

A.both of them are ignited by compressed air
B.both of them are the forms of external combustion engines
C.both of them have spark plugs
D.the power is developed by the piston in the cylinder

单项选择题

Most troubles likely to occur with marine diesel engine can, if located in time, be remedied with no difficulty and many can be （）if the engine is maintained with a high sense of responsibility to the people on the part of the motormen and engineers.

A.found out
B.eliminated
C.avoided
D.lowered

单项选择题

If （） are taken at regular intervals, any unequal distribution of load will be easily found out.

A.indicator diagrams
B.nomo-gram
C.temperature readings
D.pressure readings