The nonverbal messages that are consistent with accompanying verbal messages，but add to or strengthen or clarify the verbal message serve the function of ______. (　　　)

A．regulating

B．repeating

C．complementing

D．accenting

制冷设备在运行过程中，如遇上下述情况，应做故障停机处理。（）

A.油压过低

B.排气压力过高

C.冷冻油变质

D.出现严重液击

E.吸气压力过高