2. Two dolphin,female dolphin is 1mile behind the male. The rate of female is 15 mile per hour, while the rate of male is 10. 30 min later, what is the distance between them.我选:1.5,但答案不是“1.5”这样的,而是一个个分式,化简之后等价于1.5。
1. whether social media help advertising to change target customers?
1)social media提供了一种双向沟通的方式,给品牌和消费者,去更加多、更方便地交流消费者关心的问题
2) social media 让advertising 以lower cost to accumulate audience