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问题 填空题

常用的密钥分发技术有CA技术和 _____________技术。

答案

参考答案：KDC 或者 密钥分发中心

解析：通常使用的密钥分发技术有两种：CA 技术和 KDC 技术。CA 技术可用于公钥和保密密钥的分发，KDC 技术可用于保密密钥的分发。

单项选择题

There are about 75 brands of microwave popcorn on the market; altogether, they account for a little over half of the money from sales of microwave food products. It takes three minutes to pop corn in the microwave, compared to seven minutes to pop corn conventionally. Yet by weight, microwave popcorn typically costs over five times as much as conventional popcorn. Judging by the popularity of microwave popcorn, many people are willing to pay a high price for just a little additional convenience.
If the statements in the passage are true, which one of the following must also be true

A．No single brand of microwave popcorn accounts for a large share of microwave food product sales.

B．There are more brands of microwave popcorn on the market than there are of any other microwave food product.

C．By volume, more microwave popcorn is sold than is conventional popcorn.

D．More money is spent on microwave food products that take three minutes or less to cook than on microwave food products that take longer to cook.

E．(E) Of the total number of microwave food products on the market, most are microwave popcorn products.
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