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发表于:2019-01-27
StudyonPropertiesofPMN-PTPiezoceramicsNearMPBStudyoftheexperimentaldataindicatedthatthequaternarysystemexhibitedawell-situatedpropertyatmorphotropicphaseboundary(MPB).新...
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发表于:2020-01-30
问题详情:自圆O外一点P引切线与圆切于点A,M为PA中点,过M引割线交圆于B,C两点.求*:∠MCP=∠MPB.【回答】*:∵与圆相切于, ∴, ∵为中点,∴, ∴,∴.∵,∴△∽△,∴...