单项选择题
A.charge B.change C.discharge D.repair
The common type of liquid cargo is （）.A.oilB.chemicalC....
单项选择题The common type of liquid cargo is （）.
A.oil B.chemical C.gas D.timber
-Why do you stop working? - The winch is （）. A. work...
-Why do you stop working? - The winch is （）.
A. work well B. in good order C. out of order D. good
The safe working load of the （）is 100 tons.A.single der...
单项选择题The safe working load of the （）is 100 tons.
A.single derrick B.derrick C.heavy derrick D.deck
