The supply of carbon dioxide used in the fixed extinguishing system aboard a cargo vessel MUST be at least sufficient for（）.

A.all the spaces of a vessel

B.all cargo spaces

C.the engine room and largest cargo space

D.the space requiring the largest amount

钢筋冷拉线的两端头应（），防止在钢筋拉断或夹具失灵时钢筋弹出伤人。

A.固定装置

B.夹牢装置

C.设防护装置

D.远离作业人员