單項(xiàng)選擇題

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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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

單項(xiàng)選擇題

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