The close project process is a part of which of the following project management knowledge areas ？（）

A．project scope managemen

B．project integration managemen

C．project time managemen

D．project communication managemen

制冷系统正常工作时，干燥瓶进出管的温度是：（）

A、基本一致

B、进高出低

C、进低出高

D、温差明显