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【多选题】
下列说法正确的是()。A.
触发SQ1的作用是控制2YA得电，使缸5伸出。
B.
从图中分析，缸4退回路是：缸4无杆腔→2的节流阀→阀1的右位→大气
C.
在启动气泵，但没有按下SB2时，气缸5伸出的可能故障是阀6的常态位选错了。
D.
SQ2的作用是控制1YA和2YA同时失电，使两缸退回。
E.
阀3是控制气缸4伸出速度的。
F.
阀2是控制气缸伸出速度的。
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举一反三
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B.
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