题目：
图Ⅱ—11所示的液压系统，若右调速阀比左调速阀流量小，则实现慢速进给时，1YA、2YA、3YA、4YA启闭顺序为______。
答案：
参考答案：C
图Ⅱ—11所示的液压系统，若右调速阀比左调速阀流量小，则实现慢速进给时，1YA、2Y
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