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。
