创造洽谈气氛的策略技巧有哪些？

A. 环境温度
B. 比环境温度高20℉
C. 比环境温度高50℉

A. relieve excessive compressor head pressure
B. produce flash gas at the expansion valve
C. reduce flooding of the receiver at low load
D. defrost the evaporator coil

A. 正确
B. 错误