单选题The lifting pressure of （） is set in the presence of a Surveyor it is locked and cannot be changed.Afuel valves of main engineBinjector pump of main engineCsafety valves of marine boilerDsafety valves of a reciprocating pump
单选题
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 pump
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