物理奥赛辅导专题训练2（）

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7、meralensfarawayfromthepeople,andmakethelensintheendpiecedistanceincreaseC.cameraandmakethelensfromthepast,intheendpiecedistanceincreaseD・cameralensfromthepastatthesametime,thelensintheendpiecedistancedecreases7.sizeswere5cattleand10cattletwo,atthes