一质点由静止出发做半径R=2m的圆周运动，切向加速度<img src="https://static.zxtiku.com/wangke/imgs/topic/278391a4d09743f4dde318ce76936d04.jpg"/><img src="https://static.zxtiku.com/wangke/imgs/topic/c0300ca896f6166d0d48c46f35b45070.jpg"/>，则任意时刻质点的角加速度<img src="https://static.zxtiku.com/wangke/imgs/topic/7fe1cfd69a4f2c5d8ed2aca64520a481.jpg"/>及角速度<img src="https://static.zxtiku.com/wangke/imgs/topic/a9976711a4abad8d0f797098dff0ceb3.jpg"/>可以写成（）。<br/> A、<img src="https://static.zxtiku.com/wangke/imgs/topic/6c843b26c270e0678ca9ea032f5c09f2.jpg"/>（<img src="https://static.zxtiku.com/wangke/imgs/topic/48967cb73f273a05e842d81c73e96d5f.jpg"/>），<img src="https://static.zxtiku.com/wangke/imgs/topic/14e201b2833e35b41891fa813686c4d1.jpg"/> (<img src="https://static.zxtiku.com/wangke/imgs/topic/26d1984f41f0d17bde09c54b53c238ce.jpg"/>）<br/> B、<img src="https://static.zxtiku.com/wangke/imgs/topic/639fcd5ae81e6c1289b8370f92bf8af1.jpg"/>（<img src="https://static.zxtiku.com/wangke/imgs/topic/d17ee72dc42b5389cb7f9cf59b0b3233.jpg"/>），<img src="https://static.zxtiku.com/wangke/imgs/topic/6f2ed83160ae93b3db10fc0eb557825d.jpg"/>（<img src="https://static.zxtiku.com/wangke/imgs/topic/26d1984f41f0d17bde09c54b53c238ce.jpg"/>）<br/> C、<img src="https://static.zxtiku.com/wangke/imgs/topic/f5a818ed7864621a55e27e75591ff434.jpg"/>（<img src="https://static.zxtiku.com/wangke/imgs/topic/bb2bbaf3adc60b66896269ab86f6e428.jpg"/>），<img src="https://static.zxtiku.com/wangke/imgs/topic/6f2ed83160ae93b3db10fc0eb557825d.jpg"/>（<img src="https://static.zxtiku.com/wangke/imgs/topic/26d1984f41f0d17bde09c54b53c238ce.jpg"/>）<br/> D、<img src="https://static.zxtiku.com/wangke/imgs/topic/f5a818ed7864621a55e27e75591ff434.jpg"/>（<img src="https://static.zxtiku.com/wangke/imgs/topic/be310ab246d6bb9fbbed96740dbabba5.jpg"/>），<img src="https://static.zxtiku.com/wangke/imgs/topic/f0d953b8fb0d3ba5b002fd6157c99cab.jpg"/>（<img src="https://static.zxtiku.com/wangke/imgs/topic/26d1984f41f0d17bde09c54b53c238ce.jpg"/>）