946、当燃油油面低于活门时,通风导管内的排放浮子活门和通风通道使通风系统内的燃油排放到油箱。

　The drain float valves in the vent tubes and from the vent channels allow the fuel in the vent system to drain into the tankwhen the fuel quantity is lower than the valve.

　The drain float valves in the vent tubes and the vent channels dilute the fuel in the vent system to drain out of /thetank-when the fuel face lower than the valve.

　The drain float valves in the vent tubes and the vent channels permit fuel in the vent system to drain into the tank when thefuel level is lower than the valve.

答案解析

正确答案：C

解析：

解析:注释: allow=permit 允许; dilute 稀释。fuel quantity 燃油量;fuel level=fuel face 燃料面。

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