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．impersonate

B．personate

C．damage

D．control

下列CT基本概念中，哪项描述不正确（）

A.矩阵与像素成反比

B.窗宽与密度分辨率成反比

C.窗中心与密度分辨率成反比

D.纯水的CT值为0Hu

E.像素与图像清晰度成反比