273.APU引气流量调节是靠什么完成的?( ) The APU bleed airflow regulation by?

　防喘活门 a surge protectionvalve.

　进口导向叶片 Inlet Guide Vanes.

　引气活门 a bleed valve.

正确答案：B

解析：

题目解析 APU引气流量调节是靠进口导向叶片（Inlet Guide Vanes）来完成的。这些叶片可以调整引气流量，以确保在不同的工作条件下获得所需的引气性能。防喘活门和引气活门也与APU引气系统有关，但不直接用于流量调节。因此，正确答案为B选项。

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A330机型熟悉课程试题

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