（） play a very important part in hydraulic systems by preventing interaction between different parts of the hydraulic circuit.<br>A:Motors<br>B:Check valves<br>C:Safety valves<br>D:Reducing valve

（） play a very important part in hydraulic systems by preventing interaction between different parts of the hydraulic circuit.
A:Motors
B:Check valves
C:Safety valves
D:Reducing valve

出自：海船船员证

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