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问题 多选题

（选做题，选修3-3）

下列关于热学现象和热学规律的说法正确的是[ ]

A．布朗运动就是液体分子的无规则运动

B．热量能从高温物体传到低温物体，但不可能从低温物体传到高温物体而不产生其他影响

C．物体的温度为0℃时，物体的分子平均动能为零

D．只要知道水的摩尔质量和水分子的质量，就可以计算出阿伏加德罗常数

E．当一定质量的理想气体等压膨胀时，气体的内能一定增大

答案

BDE

填空题

Perhaps, every county suffered from inflation once or more times. Inflation is an economic condition in (B1) prices for consumer goods (B2) , and the (B3) of money or purchasing power decreases. There are three causes of inflation. The first and most important cause may be excessive government spending. For example, in order to (B4) a war or carry (B5) social programs, the government may spend more money than it has received through taxes and other revenues, thus creating a deficit. In order to (B6) this deficit, the Treasury Department can simply (B7) the money supply by issuing more paper money to (B8) the debts of government. This increase in the money supply will cause the value of the dollar to (B9) decrease. The second cause of inflation occurs when the money supply increases faster than the supply of goods. (B10) people have more money, they will run out to buy popular goods (B11) televisions and computers, for example, and a shortage will result. Industry will then produce more, at higher prices, to (B12) demand. (B13) , if people think that the prices of popular goods are going up, they will buy and even borrow money at high (B14) rates to pay for them. Finally, if labor unions demand that workers’ wages (B15) or (B16) the high cost of living, industry will meet this demand and add other costs of production on the (B17) . (B18) summary, all of these causes can (B19) inflationary problems that can affect the welfare of a nation. However, of these three causes, (B20) government spending may be the most important.

A．If

B．Whether

C．Though

D．For fear that
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解答题

某工厂五月份计划烧煤120吨，实际只用了原计划的70%，五月份节约用煤多少吨？
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