题目如图,已知线段AB=16cmAB=16cmAB=16cm,点MMM在ABABAB上,AM:BM=1:3AM:BM=1:3AM:BM=1:3,PPP,QQQ分别为AMAMAM,ABABAB的中点,则PQPQPQ的长为（ ）A.4cm4cm4cmB.6cm6cm6cmC.8cm8cm8cmD.10cm10cm10cm知识点：两点间的距离章节：图形的性质 / 图形认识初步
