单项选择题
Most lifeboats are equipped with （）.
A.unbalanced rudders
B.balanced rudders
C.contraguide rudders
D.straight rudders
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相关考题
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While reading the station bill, you find "three (3) short blasts on the whistle and three (3) short tings on the general alarm bells," this signal is for （）.
A.abandon ship
B.dismissal from fire and emergency stations
C.fire and emergency
D.man overboard -
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Hydrocarbon vapors are usually detected by the use of the （）.
A.flame safety lamp
B.combustible gas indicator
C.gasometer
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A fire involving trash and paper waste would be classified as a （）.
A.class A
B.class B
C.class C
D.class D
