单项选择题
A.light B.bulk C.dangerous D.wet
Cargo for （）No.4 is to be loaded first.A.roomB.cabinC.h...
单项选择题Cargo for （）No.4 is to be loaded first.
A.room B.cabin C.hold D.winch
Bolts, nuts, split pins, hinges, wheels and stoppers sh...
单项选择题Bolts, nuts, split pins, hinges, wheels and stoppers should be frequently （）.
A.checked B.closed C.removed D.cleared
Before opening and closing the hatches, the spaces arou...
单项选择题Before opening and closing the hatches, the spaces around the covers, all the parts and the gears should be （）.
A.cleared B.checked C.removed D.repaired
