ballast pump造句怎么写

ballast pump control system

ballast pump status-indicating system

Function test and automatic controller test for ballast pump.

They are F. O. pumps， L. O. pumps, ballast pumps, fresh water pumps, sea water pumps, and bilge pumps.

cargo and ballast pump speed control system

rotary gas ballast pump

In this paper, method of calculation for pumping of water vapour with gas ballast pump is introduced.