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即使供不应求，一辆普通自行车的价格再涨，也不会比一辆汽车的价钱高；即使供过于求，一台彩色电视机的价格再降，也不会比一台收音机便宜。决定价格既不能无限上涨、也不能无限下跌的因素是（）
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发动机过热的原因有哪些？
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市场经济是由市场配置资源的商品经济，所以，市场经济与商品经济是同一经济范畴。
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下列关于二位平行壁之间的不可压粘性流动的描述错误的是（）
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化肥特别是硝酸铵等易燃易爆的产品仓储时必须轻拿轻放，远离火种、热源，存储在阴凉、通风的专门区域，切忌与易（可）燃物、还原剂、酸类、活性金属粉混储。
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（）1955年，梦露再次被指定在一部蹩脚何片中扮演一名轻佻的歌舞女郎，这次，她愤怒了，不辞而别？
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下列方法中不属于肺癌定性诊断方法的是（）。
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衍生金融工具中的期权可分为（）。
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Income Income may be national income and personal income. Whereas national income is defined as the total earned income of all the factors of production-namely, profits, interest, rent, wages, and other compensation for labor, personal income may be defined as total money income received by individuals before personal taxes are paid. National income does not equal GNP (Gross National Product) because the factors of production do not receive payment for either capital consumption allowances or indirect business taxes, both of which are included in GNP. The money put aside for capital consumption is for replacement and thus is not counted as income. Indirect taxes include sales taxes, property taxes , and excise taxes that are paid by businesses directly to the government and so reduce the income left to pay for the factors of production. Three-fourths of national income goes for wages, salaries, and other forms of compensation to employees. Whereas national income shows the income that the factors of production earn, personal income measures the income that individuals or households receive. Corporation profits are included in national income because they are earned. Out of these profits, however, corporation profit taxes must be paid to the government, and some money must be put into the business for expansion. Only that part of profits distributed as dividends goes to the individual; therefore, out of corporation profits only dividends count as personal income. The factors of production earn money for social security and unemployment insurance contributions, but this money goes to government (which is not a factor of production), not to individuals. It is therefore part of national income but not part of personal income. On the other hand, money received by individuals when they collect social security or unemployment compensation is not money earned but money received. Interest received on government bonds is also in this category, because much of the money received from the sale of bonds went to pay for war production and that production no longer furnishes a service to the economy. The money people receive as personal income may be either spent or saved. However, not all spending is completely voluntary. A significant portion of our income goes to pay personal taxes. Most workers never receive the money they pay in personal taxes, because it is withheld from their paychecks. The money that individuals are left with after they have met their tax obligations is disposable personal income. Disposable income can be divided between personal consumption expenditures and personal savings. It is important to remember that personal saving is what is left after spending. It can be easily seen from this passage that the government levies tax on（）
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在装卸搬运爆炸性物品、氧化剂及有机过氧化物等对撞击和摩擦敏感度较高的物品时，应()，以防引起火灾和爆炸。