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Practice 3 At first, as he adjusted pumps and checked temperatures, Aaron Boucher looked like any technician in the control room of an electrical plant. Then he rushed to the window and scanned the sky, to check his fuel supply. Mr. Boucher was battling clouds, timing the operations of his power plant to get the most out of patchy sunshine. It is a skill that may soon be in greater demand, for the world appears to be on the verge of a boom in a little-known but promising type of solar power. It is not the kind that features shiny panels bolted to the roofs of houses. This type involves covering acres of desert with mirrors that focus intense sunlight on a fluid, heating it enough to make steam. The steam turns a turbine and generates electricity. The technology is not new, but it is suddenly in high demand. As prices rise for fossil fuels and worries grow about their contribution to global warming, solar thermal plants are being viewed as a renewable power source with huge potential. After a decade of no activity, two prototype solar thermal plants were recently opened in the United States, with a capacity that could power several big hotels, neon included, on the Las Vegas Strip, about 20 miles north of here. Another 10 power plants are in advanced planning in California, Arizona and Nevada. On sunny afternoons, those 10 plants would produce as much electricity as three nuclear reactors, but they can be built in as little as two years, compared with a decade or longer for a nuclear plant. Some of the new plants will feature systems that allow them to store heat and generate electricity for hours after sunset. At Nevada Solar One the other day, Mr. Boucher, 30, ran the computerized control room. He was trying to produce as much electricity as possible while saving heat to tide the plant over as clouds cast episodic shadows on the solar array. “I’ve been fighting it all day,” he said. Imperceptibly, in the dusty wind of the high desert, 182,000 mirrors moved from east to west, tracking the sun across the sky.
韩国最古老的汽车公司是（）
对可能即将发生或者已经发生的危害国家安全的事件，（）以上地方人民政府及其有关主管部门应当立即按照规定向上一级人民政府及其有关主管部门报告，必要时可以上报。
下列关于“勤俭节约，反对浪费”的叙述，正确的有（ ）。
落水者在水中游泳，为避免换气呛水可采用（）
下列哪项为切断传播途径的措施？（ ）
该企业2018年从业人员季平均人数是( )人。
建设部制定并颁布了（）针对中介房屋人员资格、中介服务机构和中介服务业务，作出了行业管理规定。
判断传播模型校正结果的参数RMS数值，在（）dB以内可以认为校正结果可行。
现浇混凝土梁侧模拆除时其混凝土强度应满足的基本条件是（）。
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