468.增压系统的活门数是( )What is the number of valves in the pressurization system

　一个溢流活门,两个安全活门,一个负压释放活门 One outflow valve, two safety valves and one negative pressure relief valve

　两个溢流活门,两个安全活门,两个负压释放活门 Two outflow valves, two safety valves and two negative pressure relief valve

　两个溢流活门,两个安全活门,一个负压释放活门 Two outflow valves, two safety valves and one negative pressure relief valve

答案解析

正确答案：C

解析：

增压系统的活门数是( ) What is the number of valves in the pressurization system 答案解析：A330飞机的增压系统包括两个溢流活门、两个安全活门和一个负压释放活门。因此，正确答案是C，即两个溢流活门、两个安全活门、一个负压释放活门。

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