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问题 选择题

下列地区最适宜发展种植业的是（　　）

A．湿润和半湿润的山区

B．湿润和半湿润的平原

C．干旱和半干旱的高原

D．干旱和半干旱的盆地

答案

中国各类土地资源的空间分布不平衡，土地生产力区域差异明显．耕地主要分布在东部季风区的平原、盆地以及低缓丘陵地区，西部耕地较少，而且分布零散．

故选：B．

单项选择题

根据考核结果定期增加公务员工资，体现的原则是（ ）

A．按劳分配

B．正常增资

C．平衡比较

D．法律保障
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问答题

If you have never seen a power plant, you might find it hard to imagine how enormously complex the equipment is or how much heat is generated by the boilers or how much coal it takes to fuel the furnaces for just one day. During the course of a day, the boilers at one of our power plants, Morgantown, for example, can turn 24 million gallons of water into steam. That generating plant alone uses 9,900 tons of coal in its furnaces in just one day. Potomac Electric Power Company (PEPCO) uses so much coal that we have purchased two 80-car unit trains to facilitate the delivery process. And Morgantown alone can produce over 25 million kilowatthours of electricity in a single day’s operation. Electricity is produced by spinning large magnets inside a coil of wire within the generator. The faster we spin the magnets, the higher will be the voltage of the electricity produced. Electricity leaves a PEPCO generator at between 13,800 and 24,000 volts. The next step in the process occurs when electricity passes through a transformer where the voltage is stepped up to continue on its journey. A transmission wire is like a small diameter pipe. Stepping up the voltage is like increasing water pressure, thus speeding the flow of energy through the system.
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