单项选择题
A.evaporation is accomplished in a vacuum
B.due to the higher temperature of the incoming feed
C.due to the latent heat of evaporation principle
D.evaporation in a submerged medium produces more distillate
单项选择题 Vessel propellers are classified as being right hand or left handA right hand propeller turns clockwise when viewed from（）.
单项选择题 Less scale formation occurs in a flash evaporator than in a submerged tube evaporator because （）.
单项选择题 A liquid sight flow indicator in a refrigeration system is examined and gas bubbles are noted in motion with the fluid flowThis means （）.