Bottom blow valves are installed on auxiliary water-tube boilers to ___________.A.complete

The exhaust valve opens before bottom dead center in a four stroke engine to______Iallow f

Temperature control valves installed in the jacket cooling water system of a diesel engine

Oil control rings used in two－stroke／cycle diesel engines are located near the bottom of t

All the rings are slightly rounded on their external top and bottom edges to keep the oil

The donkey boiler may be given a bottom blow _____.A.to raise water levelB.only while maki

Traditionally, Chinese are written ______ in columns going from top to bottom and ordered