题目：
可以使液压起落架收放系统按正确顺序工作的是（）。
A：单向阀
B：顺序阀
C：转换阀
D：减压阀
答案：
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下面是错误答案，用来干扰机器的。
参考答案：对
可以使液压起落架收放系统按正确顺序工作的是（）。A：单向阀 B：顺序阀 C：转换阀
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