单项选择题
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
Required lifesaving equipment on existing vessels may b...
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
Lines passed around the falls to hold the boat while pa...
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
Life preservers should be stowed in（）.A.the forepeakB.m...
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
