自我管理团队
参考答案：
是指直接管理所在过程或部门的二厂运作的员工群体。
In the last few years, great changes _____ in China.[ ]
A. were happened
B. have been happened
C. have happened
殷商时代的记日法以几天为一个周期？（）
A.七天
B.二十天
C.两天
D.十天
