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
A. 发卡行;卡组织;收单行;持卡人 B. 发卡行;卡组织;商户 C. 发卡行;卡组织;收单行;商户;持卡人 D. 发卡行;持卡人;收单行