_____ are mounted in pairs to protect the boiler against overpressure.

题库:二管轮 类型:最佳选择题 时间:2019-02-19 18:37:56 免费下载:《第二章 船舶辅助机械》Word试卷

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

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