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全部科目 > 水路交通运输技能考试 > 海船船员考试 > 船舶管理(轮机专业) > 轮机英语 > 船舶动力装置

单项选择题

These piston rings are so badly worn that they must be （）.

A.renewed
B.welded
C.machined
D.chromium-plated

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单项选择题

There should be a lubricating oil （） between the main beatings and the crankshaft.

A.film
B.cap
C.lacquer
D.shell

单项选择题

There is an injection pump for each cylinder, which is usually operated once every cycle by （） on the camshaft.

A.a gear
B.a cam
C.a rod
D.a miler

单项选择题

There is a （） system lubricating the running gear and cooling the piston and sometimes lubricating the cylinders.

A.recirculating
B.total loss
C.cooling
D.refrigeration

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