单项选择题
A bench hook is used for（）.
A.handing of cargo cases B.handing oilskings C.sewing canvas D.splicing small stuff
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（）.
单项选择题 A buoy having red and green horizontal bands would have a light characteristic of（）.
单项选择题 A cabinet or space containing the controls or valves for the fixed firefighting system must be（）.
