单项选择题
A.viscosity will decrease
B.volume will increase
C.volume will decrease
D.pour point will be reduced
单项选择题 If the refrigeration compressor crankcase is sweating, the cause may be due to （）.
单项选择题 The primary reason low pressure evaporators produce distillate more efficiently, and with less scale formation, than high pressure evaporators is （）.
单项选择题 Vessel propellers are classified as being right hand or left handA right hand propeller turns clockwise when viewed from（）.