紫外线消毒原理是紫外线作用于
A．细胞壁B．细胞膜C．DNAD．核糖体E．质粒
参考答案：C
In relation to the dismissal of employees, describe the circumstances when the following may occur:
(c) Redundancy. (4 marks)
对井下采区供电系统应做哪些日常检查？
