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>> 高等继续教育 / 管理学
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佳题速递：
某年某地区下岗职工已安置了13.7万人，安置率达80. 6%，安置率是（ ）。a. 变异指标b. 平均指标c. 相对指标d. 总量指标统计学原理 单相异步电动机主要缺点是不能自行起动，解决其起动问题的方法是必须有两相绕组。 机电设备控制技术 6、转变政府职能的关键是（）
A. 处理好计划和市场的关系
B. 处理好国家和企业的关系
C. 处理好中央和地方的关系
D. 政企职责分开邓小平理论 Trees mainly serve man in three important ways: They provide him with wood and other products; they provide him shade; and they help to prevent droughts and floods.Unfortunately, in many parts of the world, man has not realized that the third of these services is the most important．In his eagerness to make money from trees, he has cut them down in large numbers, only to find that without them he has lost the best friends he had. And besides, he is usually too careless to plant and look after new trees. So the forests slowly disappear.This does not only mean that man will have fewer trees. The results are even more serious: for where there are trees, their roots break up soil allowing the rain to sink in and also bind(固定) the soil, thus preventing it from being washed away easily；but where there are no trees, the rain falls on hard ground and flows away, causing floods and carrying away the rich top-soil. When the top-soil is gone, nothing remains but worthless desert.Two thousand years ago，a rich and powerful country cut down its trees to build warships, with which to gain itself an empire．It set up the empire, but, without its trees, its soil became poor and grew weak. When the empire fell to pieces, the home country found itself faced by floods and starvation(饥荒)．Land becomes desert after all trees are cut down because _ _ _ _ _ _ _ _ _ _ . 大学英语（三） 关于顿挫感染，下列叙述哪项正确医学微生物学与免疫学(基础医学) 异步传输时，进程和它请求的设备I/O操作可以同时进行。计算机操作系统