设切点的横坐标为t
y′|x=t=14t=12,解得t=2,
故选C.
One needs to work hard to realize his or her dream,as the saying goes”Hard work success”.
A.1ies in
B.results from
C.1eads to
D.begins with
简述巴纳德的组织理论的主要内容。