单项选择题
A.cover B.hatch C.derrick D.winch
Keep a close watch on（） cargo.A.valueB.valuationC.valua...
单项选择题Keep a close watch on（） cargo.
A.value B.valuation C.valuable D.All above
（）on cargo lights.A.CloseB.SwitchC.OpenD.All above.
单项选择题（）on cargo lights.
A.Close B.Switch C.Open D.All above.
These goods shall be handled with （）.A.cautionB.poisono...
单项选择题These goods shall be handled with （）.
A.caution B.poisonous C.flammable D.dangerous
