多个相邻毛囊及其所属皮脂腺的急性化脓性感染称为（）。

A.毛囊炎

B.疖

C.痈

D.丹毒

E.急性蜂窝织炎

A work authorization system can be used to （）．

A．manage who does each activity

B．manage what time and in what sequence work is done

C．manage when each activity is done

D．manage who does each activity and when it is done