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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 > 船舶辅助机械

单项选择题

In a ordinary cargo crane, （） is fitted to rotate the crane.

A.the slewing motor
B.the lulling motor
C.the hoisting motor
D.none of the above

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单项选择题

The single acting cylinder is the simplest form where pressure is applied to the full area of the piston head to move the load through piston rod extensionThe load causes rod （） when the drive pressure is released.

A.contraction
B.retraction
C.expansion
D.shrinkage

单项选择题

Among the basic categories of equipment, which of the following are used to convert the hydraulic energy into linear motion?（）

A.Hydraulic pumps
B.Valves
C.Hydraulic cylinders
D.Hydraulic motors

单项选择题

In a general cargo crane, （） is fitted to raise or lower the jib.

A.the slewing motor
B.the luffing motor
C.the hoisting motor
D.none of the above

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