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【单选题】
下列关于单向阀说法正确的是（）。A.
若将单向阀安装在泵的出口处可以防止系统的压力突然升高而损坏油泵，即起止回作用
B.
若将单向阀与节流阀或减压阀串联，可构成执行机构正向慢速，反向快速
C.
若将单向阀与压力阀串联起来，可逐步提高调整压力，增大压力的反作用
D.
对于液控制单向阀，不可以利用控制油路开启单向阀，以达到使油液能反向流动的目的
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