用一根长109.9米的绳子正好围绕树干10周,求横截面的直径. 发布时间:2017-06-30 22:39 │ 来源:www.tikuol.com 题型:解答题 问题: 用一根长109.9米的绳子正好围绕树干10周,求横截面的直径.
题型:解答题 Great changes ()in our country since twenty years ago.A.have taken placeB.have been taken placeC.took placeD.have been happened 查看答案