A thrust bearing is used with a propulsion diesel engine to

【名词&注释】

活塞环(piston ring)、救生筏(life raft)、救生圈(buoy)

[单选题]A thrust bearing is used with a propulsion diesel engine to ____.

A. control axial movement of the crankshaft
B. transmit engine thrust to the propeller shaft
C. absorb vibrations in the propeller shafting
D. prevent propeller thrust from being transmitted to the hull

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举一反三：

[单选题]活塞环的主要作用是______。

A. 散热
B. 密封
C. 布油
D. 形成油膜

[单选题]救生圈的投水试验高度为：

A. 15
B. 18米
C. 30米

[单选题]The Ship Security Plan should be submitted to____ for approval.

A. the SSO
B. the PSCO
C. the CSO
D. the Administration

[单选题]救生筏应能在多少米高度抛掷下水而不受影响使用？

A. 15米
B. 18米
C. 20米
D. 10米

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