单项选择题
A.lay B.lies C.being lain D.lying
The danger associated with using carbon dioxide in an e...
单项选择题The danger associated with using carbon dioxide in an enclosed space is（）.
A.frostbite B.skin burns C.asphyxiation D.an explosive reaction
The bottom row of plating next to the keel of a lifeboa...
单项选择题The bottom row of plating next to the keel of a lifeboat is known as the（）.
A.sheer strake B.bilge strake C.garboard strake D.keel rib
The backup system on an electric start survival craft i...
单项选择题The backup system on an electric start survival craft is a（）.
A.hydraulic system B.pneumatic system C.spare battery D.hand crank
