The successful project managers spend most of their time ______.

A) planning with their personnel
B) planning with top management
C) communicating with the project team
D) studying project results

促进胃排空的动力是 ( )

A．幽门括约肌的收缩
B．十二指肠酸性食糜的刺激
C．胃的运动
D．胃内容物的体积增加
E．胃内酸性食糜的刺激