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Some smoke alarms have been designed to be ultra-sensitive. Aspirating devices, for example, constantly suck in air in order to detect even small quantities of smoke in a room. They are often used in commercial settings, including server rooms packed with expensive computer tech.
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如果说文化上的早期中国孕育于史前时期，秦汉国家则确立了政治与疆域上的“大一统”。作为秦人经略西部边疆的见证，秦“采药昆仑”石刻（尕日塘秦刻石）的公布一度引起学界广泛争论。理不辩不明，仝涛结合严谨的文字识读与地望考证，确认其是现存于原址的唯一一处秦代刻石。这一成果表明，早在2000多年前，大一统王朝国家就已将其意志贯彻到了高原之巅、黄河之源。
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Detecting e-bike battery fires, for example, is particularly difficult, since these can unfold suddenly. Some researchers are working on new ways of sensing smoke and fire, perhaps even more quickly than before. But, take note: any certified, working smoke alarm is better than nothing.