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

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Symptoms of sea sickness include（）.

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

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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

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Sign(s) of respiratory arrest requiring artificial respiration is(are)（）.

A.vomiting
B.blue color and lack of breathing
C.irregular breathing
D.unconsciousness