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【单选题】
图示回路,溢流阀的调整压力为 5MPa ,减压阀的调整压力为 3MPa ,活塞运动时, 负载压力为 1MPa ,其它损失不计,试分析:活塞碰到死挡铁后 A 、 B 点的压力值为 ( )A.
P A =1MPa ； P B =1Mpa
B.
P A =5MPa ；P B =3MPa
C.
P A =0MPa ； P B =0Mpa
D.
P A =3MPa ； P B =0Mpa
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