客运站按照旅客要求提供送票服务的，可向旅客计收送票费，每票不超过（）
A. 5元
B. 10元
C. 12元
D. 15元
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冬季发动车可用（）预热。
A. 明火
B. 非明火
C. 木炭
The deck water seal of the inert gas system（）.
A. cools the inert gas and prevents soot from entering the cargo tanks
B. acts as an emergency shutdown when inlet pressures exceed the safe working pressure
C. prevents the backflow of hydrocarbon gasses into nonhazardous areas
D. relieves sudden large overpressures in the system
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