单选题电磁换向阀不能离开中位换向的原因是()。A有脏物进入B推杆密封留处的油压过高,摩擦阻力过大C油温过高,阀芯因膨胀而卡死DA或B或C
单选题
电磁换向阀不能离开中位换向的原因是()。
A
有脏物进入
B
推杆密封留处的油压过高,摩擦阻力过大
C
油温过高,阀芯因膨胀而卡死
D
A或B或C
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