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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 publickey does in fact belong to a given individual. Certificates help prevent some one 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.
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下列数据表。 仓库(仓库号C(3)、所在地C(8)、人数N(2)) 职工(仓库号C(3)、职工号C(2)、姓名C(8)、工资I) 有下列SQL语句： INSERT INTO 职工 VALUES("WH4","E15","张清",2800) 在命令窗口执行该命令后( )。
下列数据表。 仓库(仓库号C(3)、所在地C(8)、人数N(2)) 职工(仓库号C(3)、职工号C(2)、姓名C(8)、工资I) 为“仓库”表增加一个“面积”字段，类型为数值型，宽度是7，小数位数为2，正确的命令是( )。
MIDI enables people to use ______ computers and electronic musical instruments. There are actually three components to MIDI, the communications " ______", the Hardware Interface and a distribution ______ called "Standard MIDI Files". In the context of the WWW, the most interesting component is the ______ Format. In principle, MIDI files contain sequences of MIDI Protocol messages. However, when MIDI Protocol ______ are stored in MIDI files, the events are also time-stamped for playback in the proper sequence. Music delivered by MIDI files is the most common use of MIDI today.
Text 3 Increasingly, over the past ten years, people—especially young people—have become aware of the need to change their eating habit, because much of the food they eat, particularly processed foods, is not good for health. Consequently, there has been a growing interest in natural foods: foods which do not contain chemical additives and which have not been affected by chemical fertilizers, widely used in farming today. Natural foods, for example, are vegetable, fruit and grain which have been grown in soil and are rich in organic matter. In simple terms, this means that the soil has been nourished by unused vegetable matter, which provides it with essential vitamins and minerals. This in itself is a natural process compared with the use of chemicals and fertilizers, the main purpose of which is to increase the amount— but not the quality—of foods grown in commercial fanning areas. Natural foods also include animals which have been allowed to feed and move freely in healthy pastures. Compare this with what happens in the mass production of poultry: there are battery farm, for example, where thousands of chickens live crowded together in one building and are fed on food which is little better than rubbish. Chickens kept in this way are not only tasteless as food; they also produce eggs which lack important vitamins. There are other aspects of healthy eating which are now receiving increasing attention from experts on diet. Take, for example, the question of sugar. This is actually a nonessential food ! Although a natural alternative, such as honey, can be used to sweeten food if it is necessary, we can in fact do without it. It is not that sugar is harmful in itself. But it does seem to be addictive: the quantity we use has grown steadily over the last two centuries and in Britain today each person consumes an average of 200 pounds a year! Yet all it does is to provide us with energy, in the form of calories. There are no vitamins in it ,no minerals ,and no fibre. It is significant that nowadays fibre is considered to be an important part of a healthy diet. In white bread, for example, the fibre has been removed. But it is present in unrefined flour and of course in vegetables. It is interesting to note that in countries where the national diet contains large quantities of unrefined flour and vegetables, certain diseases are comparatively rare. Hence the emphasis is placed on the eating of whole meal bread and more vegetables by modem experts in "healthy eating". Which of the following is a reason for people’s growing interest in natural foods
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