单项选择题
Wet cargo must be kept away from （） cargo.
A.dry B.fragile C.smelling D.dangerous
单项选择题 Heavy cargo might break （）cargo, so it can’t be stowed on top of it.
单项选择题 Cargo for （）No.4 is to be loaded first.
单项选择题 Bolts, nuts, split pins, hinges, wheels and stoppers should be frequently （）.
