单项选择题
A block that can be opened at the hook or shackle end to receive a bight of the line is a（）.
A.bight block
B.gin block
C.heel block
D.snatch block
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A buoy having red and green horizontal bands would have a light characteristic of（）.
A.group occulting
B.composite group flashing
C.Morse letter A
D.quick flashing -
单项选择题
A cabinet or space containing the controls or valves for the fixed firefighting system must be（）.
A.posted with instruction on the operation of the systm
B.ventilated and equipped with explosion-proof switches
C.painted with red and black diagonal stripes
D.equipped with a battery powered source of emergency lighting -
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A carbon dioxide fire extinguisher should be recharged（）.
A.at least annually
B.whenever it is below its required weight
C.only if the extinguisher has been used
D.before every safety inspection
