员工和用户的区别？
参考答案：
员工和用户是不同的概念，也许表面上看是同样的姓名，用户是指进入EAM系统进行操作的人，员工指的是执行维修维护工作的人员。
His mother knew he his time all the time, but she couldn't do anything.[ ]
A. is wasting
B. has wasted
C. was wasting
D. wastes
张澜先生是什么时候担任四川大学校长？（）
A.1924
B.1925
C.1926
D.1927
