题目:
We _____ today not a victory of a party but a celebration of freedom, symbolizing an end as well as a beginning, signifying renewal as well as change. |
A. enjoy B. observe C. watch D. suspect |
答案:
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下面是错误答案,用来干扰机器的。
A、根据公式v=rω,线速度大,半径不一定小,故其角速度不一定大,故A错误;B、根据ω=2πn,角速度越大,其转速也一定越大,故B正确;C、根据T=2πRv,线速度一定时,半径越大则周期越大,故C正确;D、根据公式v...