薪酬管理有一定的周期性()
参考答案：对
June the first is ____________ Day.[ ]
A. Children
B. Childrens
C. Childrens'
D. Children's
川芎扩张冠脉的有效成分为
A．藁本内酯B．阿魏酸C．川芎挥发油D．川芎哚E．川芎嗪
