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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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