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题目：
单选题
A病因预防
B三早预防
C临床前期预防
D临床期预防
E病残预防
答案：
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价格管理应当在保障国家利益的前提下，保护生产者、经营者的合法经挤利益，正确处理（）之间的经济利益关系。
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By about A. D. 500 the Mound Builder culture was declining, perhaps because of attacks from other tribes or perhaps because of severe climatic changes that undermined agriculture. To the west another culture, based on intensive agriculture, was beginning to flourish. Its center was beneath present day St. Louis, and it radiated out to enclose most of the Mississippi watershed, from Wisconsin to Louisiana and Oklahoma to Tennessee. Thousands of villages were included in its orbit. By about A. D. 700 this Mississippian culture, as it is known to archaeologists, began to send its influence eastward to transform. the life or most of the less technologically advanced woodland tribes. Like the Mound Builders of the Ohio region, these tribes, probably influenced by Meso-American cultures through trade and commerce, built gigantic mounds as burial and ceremonial places. The largest of them, rising in four terraces to a height of one hundred feet, has a rectangular base of nearly fifteen acres, larger than that of the Great Pyramid of Egypt. Built between A. D. 900 and 1100, this huge earthwork faces the site of a palisaded(用栅栏围起的)Indian city which contained more than one hundred small artificial mounds marking burial sites. Spread among them was a vast settlement containing some 30,000 people by current estimations. The finely crafted ornaments and tools recovered at Ca-hokia, as this center of Mississippi culture is called, include elaborate ceramics(陶瓷制品), finely sculpted stonework, carefully embossed and engraved copper and mica(云母)sheets, and one funeral blanket fashioned from 12,000 shell beads. They indicate that Cahokia, was a true urban center, with clustered housing, markets, and specialists in tool-making, hide-dressing patting, jewelry-making, weaving, and salt-making.What is the main topic of the passage? ______A．The Mississippian culture.B．The decline of Mound Builder culture.C．The architecture of Meso-American Indians.D．The eastern woodlands tribes.
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开放式基金账户中的基金份额可通过基金管理人或代销机构申报赎回和卖出。（）
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自吸泵
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测定钙、镁时三乙醇胺为什么要在酸性溶液中加入？
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“你给我一条命，我还你一个肾，不应该吗？”这是全国道德模范曹于亚捐肾救父的话。孝老敬老是中华民族生生不息的精神基因，虽然时代交了，环境变了，孝的表现方式也有所不同，但孝敬长辈是做人的根本，永远都不会变，这体现了（）
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关于选用保冷材料的说法，正确的是（）。
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用于建立屏幕型内存变量的命令是（）。
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压力容器的压力试验包括哪些项目？
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螺杆式压缩机正常停机步骤中，（）最先开始。