单项选择题
Overgreasing of ball bearings installed on pumps will result in （）.
A.smoother pump operation B.overheating of the bearing C.reduced corrosion in the bearing D.increased pump capacity
单项选择题 The energy associated with molecules is known as （）.
单项选择题 “Flooding back” is a condition where the liquid refrigerant （）.
单项选择题 Thermal energy in transition is also referred to as （）.
