如图所示，O1为皮带传动的主动轮的轴心，轮半径为r1，Q2为从动轮的轴心，轮半径为r2，r3为固定在从动轮上的小轮半径．已知r2＝2r1，r3＝1.5r1.A、B、C分别是三个轮边缘上的点，则质点A、

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如图所示，O₁为皮带传动的主动轮的轴心，轮半径为r₁，Q₂为从动轮的轴心，轮半径为r₂，r₃为固定在从动轮上的小轮半径．已知r₂＝2r₁，r₃＝1.5r₁.A、B、C分别是三个轮边缘上的点，则质点A、B、C的向心加速度之比是(假设皮带不打滑)(　　)

A：1∶2∶3　　　　　　

B：2∶4∶3

C：8∶4∶3

D：3∶6∶2

上一题下一题 0.0难度选择题更新时间:2017-06-07 09:31:10

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C

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My name is John Brown. I am a school boy. My school is 1my home. Every day it takes me a lot of time 2 there. The road is not good, so I can't 3my bike to school. I often take a bus there. It usually 4 me forty minutes to get there 5.I 6 at seven every morning. I have no time for breakfast at home. I often have something for breakfast on the bus 7 at school. I don't want to 8school. Some students in our school take buses to school. Some students walk to school 9 their homes are not far.10students ride bikes

物质	甲	乙	丙	丁
反应前物质质量/g	8	32	5	4
反应后物质质量/g	16	4	x	24

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