已知点M 1 (6,2)和M 2 (1,7),直线y=mx-7与线段M 1 M 2 的交点M分有向线段 x D = 4+ 2 2 ×(-1) 1+ 2 2 =9-5 2 y D = 1+ 2 1+ 2 2 = 2 . 的比为3:2,则m的值为______.
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【单选题】This questionnaire was divided into several ______ because it was necessary to collect information about the dementia sufferer from different sources.
【单选题】This questionnaire was divided into several _________ because it was necessary to collect information about the dementia sufferer from different sources.