单项选择题
The energy associated with molecules is known as （）.
A.kinetic energy B.potential energy C.mechanical energy D.thermal energy
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 （）.
单项选择题 Noise in a refrigeration compressor can be caused by （）.
