搜索 - 科创

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是的，正是这样。两片铝箔挨的很近，当子弹打过来的时候会把他们接通。只要测量两次，根据速度公式V（速度）=S（路程）/T（时间）就可以算出来速度了。上面的程序就是用来检测两个时间，然后计算速度的。不过由...

IR2110的优点是不少，不过它不能产生负偏压，如果用于驱动桥式电路，带感性负载运行，桥电路做切换的时候，电感会产生反相的电动势，处于关断状态下的IGBT，由于续流二极管的恢复过程，IGBT将承受集电...

首届全国气象行业地面气象测报技能竞赛地面气象报告编制试卷一、单项选择题（共5分，每小题0.5分。答案只能填字母）1. 气象旬（月）报电码型式共包括（）段。A：3 ...

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