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[单选题] 实现经济社会可持续发展的关键是（ ）
A
速度、比例和效益的统一
B
经济发展与人口、资源、环境相协调
C
形成一、二、三产业的合理结构
D
科技、教育与经济的紧密结合
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试题答案：
B
答案解释：
在党的十四届五中全会上，江泽民提出：要把控制人口、节约资源、保护环境放到重要位置。使人口增长与社会生产力的发展适应，使经济建设与资源环境相协调，从而实现可持续发展
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中国民主促进会第十三届中央委员会第五次全体会议12月7日在( )开幕。
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海湾产油国为了应对低油价导致财政收入骤降，正以有史以来最快的速度发行债券。根据美国迪罗基公司的数据显示，沙特阿拉伯、阿联酋、巴林、科威特、卡塔尔、阿曼6国2016年已募集了破纪录的( )亿美元
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1.
21．下列不属于企业文化行为特性的是
2.
和直线3x-4y+5=0关于2轴对称的直线的方程为（ ）
3.
4.
当或有事项有关的义务符合确认为负债的条件时应将其确认为（）
5.
3. Friction is a force which opposes motion. Much of the energy supplied to a complicated machine with many moving parts is wasted in overcoming this opposition. The energy is converted into useless heat. The amount thus lost can be considerably reduced and the life of the machine prolonged by careful lubrication. This reduction improves the efficiency of the machine. Another way in which friction is reduced is to substitute roller or ball bearings for the earlier type of bearing, in which the surfaces in contact move by sliding. Bearings of these later types are used very extensively in many kinds of modern machinery.It must not be assumed, however, that friction is always a disadvantage. In many instances it is highly important. Belts are often used in conveying power from one machine to another. In the absence of friction, this could not be done. The driving wheel would not run the belt, neither would the belt run the wheel to driver. Without friction, then, belted machinery could not be used. Again in the case of all motor vehicles, friction is essential in the operation of the brake. Were there no friction, there could be no brake. But even this illustration does not give an adequate picture of the importance of friction. The vehicle could not even be started if it were not for the friction exerted between the tires and the road. Nails hold in wood, and screws hold in either wood or metal by reason of friction, without which they would be useless. Walking is difficult enough on an icy pavement, but it would be wholly impossible if there were no friction at all between the shoe and the pavement.(5分)3.1 Friction arises when____.(1分)A. an opposing force of motion exists B. the energy is wastedC. everything is motionlessD. a complicated machine is supplied with energy
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