问题
问答题 简答题
保持适当的铝水平有什么作用？
答案
参考答案：
保持适当铝水平的作用是：
1）它保护着阴极碳块，减少生成炭化铝。
2）它使阳极底掌中央部位多余的热量通过这层良导体传输到阳极四周，使槽内各部分温度趋于均匀。
3）它填充了槽底上高洼不平之处，使电流比较均匀地通过槽底。
4）高铝液层能够削弱磁场产生的作用力。
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保持适当的铝水平有什么作用？
参考答案：
保持适当铝水平的作用是：
1）它保护着阴极碳块，减少生成炭化铝。
2）它使阳极底掌中央部位多余的热量通过这层良导体传输到阳极四周，使槽内各部分温度趋于均匀。
3）它填充了槽底上高洼不平之处，使电流比较均匀地通过槽底。
4）高铝液层能够削弱磁场产生的作用力。
In 1990 a report was published about what the earth might be like 20 years from then on. The report was a result of a three-year ___36___. according to the report, the picture of the earth in the year 2010 is not a ___37___ one. The world will be more __38___ because the population will continue to grow. The population could be ___39__ 6 300 million, almost 2 150 million more than in 1985. More people would move into cities, especially cities in ___40___ countries. Cities like Cairo and Jakarta probably would ___41___ have 15 million by then. Food production will ___42___, but not enough to feed all the people. Farmers will grow 90% more food than they did in 1985, __43___ most of the increase would be in countries that ___44___ produce enough food for their people. Little increase is ___45___ in South Asia, Africa and the Middle East. Poor farming ways are ___46___ large areas of crop land, changing farms into deserts. More farmland is ___47___ as cities become larger and more houses are built. ___48___ will get worse as industrial countries burn more coal and oil. Many of the world’s ___49___ could disappear as more and more trees are cut down. Energy will continue to be a serious problem. The experts say their picture of the earth for the year 2010 ___50___. They only carried out the situation that ___51___ today. By changing the situation, by ___52___ the problems, the picture can be changed. There is ___53___ time for the nations of the world to work ___54___ a plan of action. But they warned that ___55___ too long to make decisions would greatly reduce the chances of success.
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