激光切割机工房地面太湿太滑有什么危害？
参考答案：
湿滑地面作业，会导致人员摔伤、扭伤。
I'm sorry that I can not accept your ________ to attend your birthday party, Linda, because I'm
________ to answer all the customers' letters tonight by my boss. [ ]
A. requirement; required
B. demand; requested
C. request; asked
D. request; required
全球物流环境中，政治法律环境和趋势对公司来说，意味着麻烦和成本上升。
