A.a continuous ringing for 10 seconds
B.one short ring followed by one long ring
C.two long rings of at least 20 seconds
D.a continuous ringing until the fire is extinguished
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A.gives up
B.gives away
C.gives in
D.gives off
A.the chief engineer
B.the person about whom the entry concerns
C.one other crew member
D.no other signature is required
A.base
B.under part
C.bottom
D.down place
A.suffocate the fire
B.absorb the oxygen supporting the fire
C.act as a cooling agent
D.wash the fire away
A.guy failures
B.topping lift failures
C.bending of the boom from compression
D.gooseneck failure
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Full details of all lights and fog signals are shown on（）.
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