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社会主义制度在我国基本建立起来的标志是______。
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现代企业制度的核心是______。
Happiness can be described as a positive mood and a pleasant state of mind. According to recent investigations, sixty to seventy percent of Americans consider themselves to be moderately happy, one in twenty persons feel very happy. Psychologists have been studying the factors contributing to happiness. It is not predictable nor is a person in an apparently ideal situation necessarily happy. The ideal situation may have little to do with his actual feelings. A good education and income are usually considered necessary for happiness. Though both may contribute, they are only chief factors if the person is seriously under-educated or actually suffering from lack of physical needs. The rich are not likely to be happier than the middle-income group or even those with very low incomes. People with college education are somewhat happier than those who didn"t graduate from high schools, and it is believed that this is mainly because they have more opportunity to control their lives. Yet people with a very high income and a college education may be less happy than those with the same income and no college education. It should be noted that people quickly get used to what they have, they are happiest when they feel they are increasing their level, no matter where it stands at a "given time. The best formula for happiness is to be able to develop the ability to tolerate frustration, to have a personal involvement and commitment, and to develop self-confidence and self-esteem. Which of the following statements is NOT true
People born in autumn live longer than those born in spring and are less likely to fall chronically ill when they are older, according to an Austrian scientist. Using census(人口普查)data for more than one million people in Austrian, Denmark and Australia, scientists at the Max Plank Institute for Demographic(人口统计的)Research found the month of birth was related to life expectancy over the age of 50. Seasonal differences in what mothers ate during pregnancy, and infections occurring at different times of the year could both have an impact on the health of a new-born baby and could influence its life expectancy in old age. "A mother giving birth in spring spends the last stage of her pregnancy in winter, when she will eat fewer vitamins than in summer," said one of the scientists. "When she stops breast-feeding and starts giving her baby normal food, it"s in the hot weeks of summer when babies are inclined to infections of the digestive system. " In Austria, adults born in autumn lived about seven months longer than those born in spring, and in Denmark adults with birthdays in autumn outlived those born in spring by about four months. In the southern hemisphere, the picture is similar. Adults born in the Australian autumn lived about four months longer than those born in the Australian spring. The study focused on people born at the beginning of the 20th century, using death certificates and census data. Although nutrition at all times of the year has improved since then, the seasonal pattern persists. The term "life expectancy"(Line 5)refers to______.
2009年10月，中国某市对外贸易进出口总公司与波兰某钢铁公司在北京市签订了一份某型号钢材的购销合同。该合同约定如果履行合同发生纠纷，由中国国际经济贸易仲裁委员会进行仲裁。后波兰公司并未按合同约定的时间交付货物，构成违约，并给中国某市对外贸易进出口总公司造成严重的经济损失。为此，中国某市对外贸易进出口总公司向其住所地市中级人民法院提起诉讼。要求波兰某公司承担违约责任。并赔偿其全部损失。根据上述情况，请回答： 本案中中国某市对外贸易进出口总公司的做法是否得当为什么
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