《国际海运危险货物规则》中的第1大类危险货物是()。

A．放射性物质

B．易燃液体

C．爆炸品

D．腐蚀性物质

0vercarring is best prevented by（）.

A.assuring heavy cargo is stowed low in the vessel

B.checking the vessel's load line calculations carefully

C.inspection of the hold at completion of discharge

D.stowing the cargo which is to be discharge last on the bottom