单项选择题
An inland oil barge must have equipment available to remove an on-deck oil spill of at least（）.
A.one barrel B.two barrels C.five barrels D.ten barrels
单项选择题 A shroud is（）.
单项选择题 A pumproom is suspected of accumulating gases after a ventilation machinery breakdown. Where should the combustible gas indicator case be placed when testing the pumproom atmosphere for combustible gases?（）.
单项选择题 A partial deck in a hold is called a(n)（）.
