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当前学科：信息安全知识竞赛
题目：
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为了正确获得口令并对其进行妥善保护，应认真考虑的原则和方法有（）。
A . 口令／帐号加密
B . 定期更换口令
C . 限制对口令文件的访问
D . 设置复杂的、具有一定位数的口令
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Camping Camping wild is a wonderful way to experience the natural world and， at its best， it makes little environmental influence. But with increasing numbers of people wanting to escape into the wilderness， it is becoming more and more important to camp unobtrusively （不引人注目地） and leave no mark. Wild camping is not permitted in many places， particularly in crowded lowland Britain. Wherever you are， find out about organizations responsible for managing wild spaces， and contact them to find out their policy on camping and shelter building. For example， it is fine to camp wild in remote parts of Scotland， but in England you must ask the landowner's permission， except in national parks. Camping is about having relaxation， sleeping outdoors， experiencing bad weather， and making do without modern conveniences. A busy， fully-equipped campsite （野营地） seems to go against this， so seek out smaller， more remote places with easy access to open spaces and perhaps beaches. Better still， find a campsite with no road access： walking in makes a real adventure. Finding the right spot to camp is the first step to guaranteeing a good night's sleep. Choose a campsite with privacy and minimum influence on others and the environment. Try to use an area where people have obviously camped before rather than creating a new spot. When camping in woodland， a void standing dead trees， which may fall on a windy night. Avoid animal runs and caves， and possible homes of biting insects. Make sure you have most protection on the windward side. If you make a fire， do so downwind of your shelter， always consider what influence you might have on the natural world. Avoid damaging plants. A good campsite is found， not made — changing it should be unnecessary. Camping wild is a wonderful way to experience the natural world.（） Wild camping is always permitted in many places.（） Wild camping is always permitted in many places.（） It is becoming more and more important to camp unobtrusively and leave no mark.（） Wherever you are， you don't have to know about the local policy on camping and shelter building（） In England you must ask the landowner's permission for camping， except in national parks.（） Camping is relaxation with the help of modern conveniences.（） Finding a campsite with no road access is better still.（） Finding the right spot to camp is the first step to guaranteeing a good night's sleep.（） Animal runs，caves and homes of biting insects are best places for camping.（） ometimes you need to make electricity.（）
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