用ballast pump造句子，“ballast pump”造句

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

rotary gas ballast pump

Function test and automatic controller test for ballast pump.

ballast pump status-indicating system

ballast pump control system

cargo and ballast pump speed control system

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