單項選擇題

When the ships is going to enter into the harbor,（）.

A.change from diesel oil to heavy fuel oil for mail engine
B.pump out bilge water
C.change sea chest form lower level one to high level one
D.test emergency generator

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單項選擇題

Most often （） is attached to the engine-propeller shaft for efficient electric power generation.

A.a variable-speed AC generator
B.a fixed-speed AC generator
C.an air blower
D.a DC generator

單項選擇題

In today’s practice, with cylinders of equal diameter of bore and equal revolutions, the two-cycle engine delivers a power about 80 percent （） than that of the four-stroke one.

A.greater
B.better
C.smaller
D.less

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When the ships is going to enter into the harbor,（）.

你可能感興趣的試題

Most often （） is attached to the engine-propeller shaft for efficient electric power generation.

In today’s practice, with cylinders of equal diameter of bore and equal revolutions, the two-cycle engine delivers a power about 80 percent （） than that of the four-stroke one.