相关考题
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单项选择题
Bolts, nuts, split pins, hinges, wheels and stoppers should be frequently （）.
A.checked
B.closed
C.removed
D.cleared -
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 -
单项选择题
The foreman said three （）would come on board to load cargo.
A.teams
B.parties
C.gangs
D.pairs
