You have been working in a company White & Associates for five years. But now you decide to quit because you are moving to another city with your parents. Write a letter to your boss, Mr. Brown, telling him your decision, stating your reason(s), and making an apology.
You were unable to attend Mr. Wongs examination on Academic Writing because you got sick that morning. Write a letter to express the reasons for not being able to attend it, apologize and suggest a solution.
下面对商鞅变法论述不正确的是()。
A. 是一次新兴地主阶级建立地主阶级专政的改革
B. 是一次废除土地私有制的革新
C. 是一次土地私有制代替奴隶制的土地国有制的改革
D. 是一次废除奴隶主贵族特权的革新
ISO的OSI安全体系结构中,以下哪一个安全机制可以提供抗抵赖安全服务()
A. 加密
B. 数字签名
C. 访问控制
D. 路由控制