单项选择题
A.no equipment in contact with sea water B.less equipment in contact with fresh water C.more equipment in contact with sea water D.less equipment in contact with sea water
You must take good care of the drainage cock of the air...
单项选择题You must take good care of the drainage cock of the air control systemBecause （） leads scale formed which might malfunction the pilot control valve and other instruments.
A.the temperature B.the rust C.the pressure D.the humidity
You increased the （） to 150 tons that’s why the fuel oi...
单项选择题You increased the （） to 150 tons that’s why the fuel oil （）.
A.pumped speed；came out B.pumping rate；overflowed C.flowing rate；leaked out D.flowed speed；spilled out
Worn out ring grooves should be （） to standard dimensio...
单项选择题Worn out ring grooves should be （） to standard dimension after being welded.
A.machined B.bored C.honed D.drilled
