社会性需要

A. 10～15；
B. 14～20；
C. 14～30；
D. 10～25。

A. send a requisition list to the supplier
B. check that whether the items ordered have been already delivered
C. make the chief engineer on sport
D. follow a preset procedure

A. 漂移
B. 稳定性
C. 灵敏度
D. 偏移