单项选择题

When sailing in cold zones, the（） should be heated.

A.the steering gear room
B.the fire fighting pipe line
C.the fuel oil tank
D.the bath room

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单项选择题

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

单项选择题

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

单项选择题

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