Low pressure air is usually taken through （） or pressure regulators to a low pressure reservoir supplying a ring main through driers.<br>A:globe valves<br>B:butterfly valves<br>C:gate valves<br>D:reducing valves

Low pressure air is usually taken through （） or pressure regulators to a low pressure reservoir supplying a ring main through driers.
A:globe valves
B:butterfly valves
C:gate valves
D:reducing valves

出自：海船船员证

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