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

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单项选择题

A.sheer strake
B.bilge strake
C.garboard strake
D.keel rib

单项选择题

A.hydraulic system
B.pneumatic system
C.spare battery
D.hand crank

单项选择题

A.fever and thirst
B.nausea and dizziness
C.stomach cramps and diarrhea
D.reddening of skin and hives