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问题 单项选择题

某女性，纺织厂织布车间挡车工，工龄12年，电测听检查，见双耳听力曲线上在4000Hz处听力下降超过 30dB，此改变屑于

A．听觉适应

B．听觉疲劳

C．听力损伤

D．噪声聋

E．爆震性耳聋

答案

参考答案：C

单项选择题 A1/A2型题

使髋关节屈曲的肌肉主要是（）。

A.股直肌

B.髂腰肌

C.臀大肌

D.半膜肌

E.臂中肌
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单项选择题

Certificates are （71） documents attesting to the （72） 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 （73） someone else. In their simplest form, Certificates contain a public key and a name. As commonly used, a Certificate also contains an （74） date, the name of the CA that issued the Certificate, a serial number, and perhaps other information. Most importantly, it contains the digital （75） 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．text

B．data

C．digital

D．structured
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