t0.9指药物含量降低多少时所用的时间( )%
A.90B.10C.75D.25E.37~40
参考答案:B
解析:[知识点] 半衰期
The 2011 International University Games in Shenzhen now appeals to a lot of people across the world.
A.held
B.is being held
C.being held
D.to be held
同一层次的多个企业为了争夺同一目标市场而发生的冲突,这种冲突称为()。
A.多渠道冲突
B.垂直渠道冲突
C.水平渠道冲突
D.渠道系统竞争