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问题 单项选择题

男孩，7岁。低热三天，两下肢及臀部有出血性皮疹，突出皮面，伴腹痛及便血一次，可能的诊断为

A．过敏性紫癜
B．血小板减少性紫癜
C．消化性溃疡
D．流行性脑脊髓膜炎
E．以上都不是

答案

参考答案：A

单项选择题

Certificates are （） documents attesting to the （） 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 （） someone else. In their simplest form, Certificates contain a public key and a name. As commonly used, a Certificate also contains an （） date, the name of the CA that issued the Certificate, a serial number, and perhaps other information. Most importantly, it contains the digital （） 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.

to the （） of a public key to an individual or other entity.

A．connecting

B．binding

C．composing

D．conducting
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单项选择题

人工心脏起搏的作用机制是（）

A.替代心脏的自律性与兴奋性

B.替代心脏的自律性与传导性

C.替代心脏的兴奋性与传导性

D.替代心脏的自律性与收缩性

E.替代心脏的兴奋性与收缩性
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