新产品的试销首先应在哪类客户之间进行?()
A.普通客户
B.重点客户
C.潜在客户
参考答案:B
A.某种机械既可省力,又可省功
B.某物体的质量很大,但具有动能却较小
C.某机械的功率很大但做功很慢
D.某机械的效率为105%
Planning, organizing , leading and controlling are not very closely interrelated in practice.