A.annually B.once every two years C.once every four years D.once every five years
A.may be substituted for 10 percent of the required life preservers B.should be stowed adjacent to lifeboats and emergency stations C.may be used by boat crews and line handlers during lifeboat drills D.should be used when carrying out duties near a weather deck's edge
A.a month B.in each week C.in every 6 months D.in every 12 months