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单选题
229.关于起落架的描述正确的是( )which description of the landing gear is correct?
A
主起落架是单气腔结构,主用封圈失效时可通过转换活门起用备用封圈;前起落架是双气腔结构,主用封圈失效时可通过转换活门起用备用封圈 Main landing gear is a single cavity structure, when the main seal failure can using standby seal ring through the transfer valve; the nose landing gear is a double cavity structure, when the main seal failure can use spare seals through transfer valve。
B
主起落架是双气腔结构,主用封圈失效时可通过转换活门起用备用封圈;前起落架是单气腔结构,主用封圈失效时可通过转换活门起用备用封圈 Main landing gear is a double cavity structure, when the main seal failure can using standby seal ring through the transfer valve; the nose landing gear is a single cavity structure, when the main seal failure can use spare seals through transfer valve。
C
主起落架是单气腔结构,主用封圈失效时不能通过转换活门起用备用封圈;前起落架是双气腔结构,主用封圈失效时可通过转换活门起用备用封圈 Main landing gear is a single cavity structure, when the main seal failure can not using standby seal ring through the transfer valve; the nose landing gear is a double cavity structure, when the main seal failure can use spare seals through transfer valve。
答案解析
正确答案：A
解析：
题目解析
正确答案：A
解析：根据描述，主起落架是单气腔结构，主用封圈失效时可以通过转换活门起用备用封圈；前起落架是双气腔结构，主用封圈失效时可以通过转换活门起用备用封圈。选项A中的描述与此相符，因此选项A为正确答案。
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