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The lifting pressure of （） is set in the presence of a Surveyor it is locked and cannot be changed.

A、fuel valves of main engine

B、injector pump of main engine

C、safety valves of marine boiler

D、safety valves of a reciprocating pum

时间：2022-01-04 14:56 关键词： 船舶电气与船舶安全

答案解析

C