单项选择题
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
Symptoms of sea sickness include（）.A.fever and thirstB....
单项选择题Symptoms of sea sickness include（）.
A.fever and thirst B.nausea and dizziness C.stomach cramps and diarrhea D.reddening of skin and hives
Symptoms of heat stroke are（）.A.cold and moist skin，hig...
单项选择题Symptoms of heat stroke are（）.
A.cold and moist skin，high body temperature B.cold and dry skin，low body temperature C.hot and moist skin，high body temperature D.hot and dry skin，high body temperature
