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关于影子得长度有1米长得标杆其影长为1.2米,同时旗杆得投影一部分在地面上,另一部分在一个与地面夹角为45度得小山坡上,
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He shouted at her ," I 'm going out to eat in a restaurant."
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It's impolite for us to laugh at someone who makes mistakes.
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一艘轮船行于甲乙两个码头之间.顺水时航行需要3小时.逆水返回比顺水时多用了30分钟.已知轮船在静水中的速度是26千米每小
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英语翻译Most people usually traveled by ship and train which are
1年前