（） are mounted in pairs to protect the boiler against overpressure.<br>A:Safety valves<br>B:Water tubes<br>C:Steam stop valves<br>D:Blow down valves

（） are mounted in pairs to protect the boiler against overpressure.
A:Safety valves
B:Water tubes
C:Steam stop valves
D:Blow down valves

出自：海船船员证

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