Pressurereducingvalvesareusedto
A. providebranchpressurelowerthansystempressure
B. providebranchpressurehigherthansystempressure
C. providezerobranchpressure
D. limitsystempressure
查看答案
Pressurereducingvalveisnormallyclosed.
A. 对
B. 错
Pressurereducingvalvecontrolsinletportpressure.
A. 对
B. 错
Pressurereducingvalveisusuallyconnectedbeforeasub-circuit.
A. 对
B. 错
Pressurereducingvalveisusuallyconnectedbetweenpumpandtank.
A. 对
B. 错
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