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问题 填空题
在一个比例中，两个外项互为倒数，其中一个内项是
8
7
，另一个内项是______．
答案

因为在一个比例里，两个外项互为倒数，说明两个内项也互为倒数，

根据一个内项是

8
7
，所以另一个内项是：1÷
8
7
=1×
7
8
=
7
8
；

故答案为：

7
8
．

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.

71（）

A．text

B．data

C．digital

D．structured
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判断题

洛氏硬度在测定时是用压痕面积来表示硬度值的大小。
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