单项选择题
Safety shackles are fitted with（）.
A.a threaded bolt
B.a round pin，with a cotter pin
C.a threaded bolt，locknuts，and cotter pins
D.round pins and locknuts
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相关考题
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单项选择题
Required lifesaving equipment on existing vessels may becontinued in use on the vessel if（）.
A.kept on board no more than 2 years
B.inspected and serviced every 6 months
C.destroyed if more than 5 years old
D.maintained in good and serviceable condition -
单项选择题
Lines passed around the falls to hold the boat while passengers are boarding are（）.
A.life lines
B.frapping lines
C.tricing lines
D.tripping lines -
单项选择题
Life preservers should be stowed in（）.
A.the forepeak
B.messrooms
C.convenient protected topside locations
D.locked watertight containers
