题干采购管理的基本目标有()。
A.降低采购成本
B.确保生产经营的物资需要
C.增加采购物品的数量
D.发现和发展有竞争力的供应商
E.减少存货损失
参考答案:A, B, D, E
—How can I make friends in a new school?
—Say hello to _____ to you today, and you can have a friend tomorrow. [ ]
A. new someone
B. someone new
C. new anyone
微分方程y"+(λ1+λ2)y’+λ1λ2y=0(λ1≠λ2且为实数),满足y(0)=0,y’(0)=1的特解为______.