【单选题】
The safety valve should be （） in the presence of C/E and Surveyor.
A、tightened up
B、sealed up
C、opened up
D、unscrewed
查看正确答案A、Relief valves B、Check valves C、Safety valves D、Reducing valve
搜题
更多“The safety valve should be （） in the presence of C/E and Surveyor.”相关的问题
第4题
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
第8题
A、fuel valves；exhaust valve B、exhaust valves；inlet valve C、fuel valves；inlet valve D、exhaust valves；fuel valve
