一只盒子中有红球m个，白球8个，黑球n个，每个球除颜色不同外都相同．从中任取一个球，取得白球的概率与不是白球的概率相同，那么m与n的关系是( )．
m+n=8
10s内通过灯泡L1的电荷量为15C，1min内通过灯泡L2的电荷量为30C．则通过灯泡L1和L2的电流之比是______．灯泡L1和L2不可能是______联．
（）is software about the relation between the customer the customer and the supplier in marketing
A.Customer Relationship Management (CRM)
B.Customer service
C.Sales planning
D.Distribution channel
