我
- A.soda solution
- B.mechanical impurities
- C.ballast
- D.water and residuals
- A.protect the pump from fine soluble contaminants
- B.prevent solid particles from entering the pump
- C.prevent solid particles from entering the filter
- D.protect the directional control valves
- A.so a height
- B.such a height
- C.so high
- D.such high
- A.gas freed
- B.inerted
- C.filled with water
- D.all of the above as necessary
- A.prevent the seawater from intergrating
- B.prevent the lube oil from running out of the outside aboard
- C.strengthen the intencity of the sterntube
- D.prevent the mud and sand from entering the lube oil system
- A.later and close sooner
- B.sooner and close later
- C.sooner and close sooner
- D.later and close later
- A.evaporator
- B.condenser
- C.expansion valve
- D.compressor
- A.hose joints are made up
- B.tanks are being topped off
- C.system is being lined up
- D.pumping operation is first started
- A.The diameter of a disc is the same as the outer diameter of the pipe
- B.We can infer that the valve is opened or closed by rotating the spindle
- C.A butterfly valve comprises a disc and a ring body
- D.The profile of the butterfly valve is a ring body
- A.machined
- B.bored
- C.honed
- D.drilled
