简述维A酸类药物的作用机理,请列出第一代、第二代维A酸产品及其适应证。
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中央八项规定要求,中央政治局同志除中央统一安排外,个人不公开出版著作、讲话单行本,不发贺信、贺电,不题词、题字。
A. 正确
B. 错误
A network administrator is verifying the configuration of a newly installed host by establishing an FTP connection to a remote server. What is the highest layer of the protocol stack that the nework administrator is using for this operation?()
A. application
B. presentation
C. session
D. transport
E. internet
F. data link