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蒸汽疏流水器极其作用（）。
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如何处理顶板冒落空洞内积聚的瓦斯？
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潜油泵的主要参数有四个，（）不属于潜油泵的主要参数。
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在旧中国，农民（）遇到风调雨顺的好年景，（）逃脱不了悲惨的命运
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The economy of the United states after 1952 was the econnomy of a well-fed,almost fully employed people. Despit occasional alarms, the country escaped any postwar depression and lived in a state of boom. A n economic survey of the year 1955, a typical year of the 1950’s, may be typical as illustrating the rapid economic growth of the decade. The national output was value at 10 percent above that of 1954 (1955 output was estimated at 392 billion dollars). The production of manufacturers was about 40 percent more than it had averaged in the years immediately following World War 2. The country’s business spent about 30billion dollars for new factories and machinery. National income available for spending was almost a third greater than it had been it had been in 1950. Consumers spent about 256 billion dollars; that is about 700 million dollars a day ,or about twenty-five million dollars every hour , all round the clock. Sixty-five million people held jobs and only a little more than two million wanted jobs but could not find them . Only agriculture complained that it was not sharing in the room. To some observers this was an ominous echo of the mid-1920’s . As farmer’s shre of their products declined , marketing costs rose. But there were , among the observers of the national economy, a few who were not as confident as the majority . Those few seemed to fear that the boom could not last and would eventually lead to the oppsite-depression. What is the best title of the passage?（） In Line 3, the word “boom” could best be replaced by（）. It can be inferred the national from the passage that most people in the United States in 1955 viewed the national economy with an air of （）. Which of the following were LEAST satisfied with the national economy in the 1950’s?（） The passage states that incom available for spending in the U.S. was greater in 1955 than in 1950 . How much was it （）?
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色甘酸钠预防哮喘发作的主要机制是
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腹部体毛的分布，下列哪一项描述是错误的（）
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某一种物质完全肾小球滤过，然后又由肾小管完全吸收，则该物质的清除率是（）
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钢筋的屈服强度是指()A.比例极限B.弹性极限C.屈服上限D.屈服下限
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在EPG上的告警类型有（）