什么是南拳？

A. 数据链路层
B. 网络层
C. 应用层
D. 传输层

A. 全面盘点
B. 随机抽查盘点
C. 离任交接盘点
D. 临时盘点

A. the pressure regulating valve is not closing
B. an excessive lack of refrigerant in the system
C. badly leaking discharge valves
D. worn piston ring