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單項(xiàng)選擇題

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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單項(xiàng)選擇題
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
單項(xiàng)選擇題
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