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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 1.5MPa ,其它损失不计,试分析:活塞在运动期间 A 、 B 点的压力值为 ( )A.
P A = 1.5 MPa ； P B = 1.5 MPa
B.
P A =3MPa ； P B =5Mpa
C.
P A =1.5MPa ； P B =5Mpa
D.
P A =0MPa ； P B =0Mpa
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