患者，女性，20岁。因"全身皮疹伴表皮破溃2天"就诊。患者1周前出现上呼吸道感染，多次给予多种抗生素及退热药物，2天前躯干部出现红色点状皮疹，迅速增多、增大，伴大小不等水疱、破溃。查体：T37.6℃，口腔黏膜轻度糜烂，躯干、四肢弥漫性暗红色斑片，伴大小不等松弛性水疱、大疱，尼氏征（+），部分水疱破溃见表浅糜烂面，水疱及破溃面积约占体表面积的40%。

根据其临床表现，诊断考虑为（）。

A.中毒性表皮坏死松解症

B.重症多形红斑

C.剥脱性皮炎

D.天疱疮

E.家族性慢性良性天疱疮

Certificates are (16) documents attesting to the (17) of a public key to an individual or other entity. They allow verification of the claim that a given public key does in fact belong to a given individual. Certificates help prevent someone from using a phony key to (18) someone else. In their simplest form, Certificates contain a public key and a name. As commonly used, a certificate also contains an (19) date, the name of the CA that issued the certificate, a serial number, and perhaps other information. Most importantly, it contains the digital (20) of the certificate issuer. The most widely accepted format for certificates is X.509, thus, Certificates can be read or written by any application complying with X.509.

A．communication

B．computation

C．expectation

D．expiration