单项选择题 2017年8月，某作家在杂志上发表一篇文章，取得稿酬30000元。已知稿酬所得个人所得税税率20％，每次收入4000元以上，减除20％的费用，该作家发表文章应缴纳个人所得税税额的下列计算列式中，正确的是（）。

单项选择题 在MDK中是通过一个枚举类型定义的，关于其参数值的说法错误的是（）。

单项选择题 E-commerce has the capability to integrate all inter-company and intra-company functions, meaning that the three flows of the supply chain could be also affected by e-commerce. Which is not conclude the three flows? A、physical flowB、financial flowC、information flowD、time flow