- programexceptioncode(PEC)ThefirstidentificationandmolecularepidemiologyofPECinChinaInordertomeasureandstudytheelectricitygeneratingperformanceofthepiezoelectricceramics(PEC),ameasuringsystemfortheelectricitygeneratingcapacityofthePECwasdeveloped.Obje...
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- 问题详情:如图,在边长为2的等边△ABC中,AD⊥BC于点D,且AD=,E为AC中点,P为AD上一点则△PEC周长的最小值是.【回答】__. 知识点:等腰三角形题型:填空题...
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