问题
填空题
M20×2--6H/6g表示两螺纹配合，其中20为（），2为（），6H表示（），6g表示（）。
答案
参考答案：细牙螺纹公称直径；细牙螺纹螺距；内螺纹公差带；外螺纹公差带
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M20×2--6H/6g表示两螺纹配合，其中20为（），2为（），6H表示（），6g表示（）。
参考答案：细牙螺纹公称直径；细牙螺纹螺距；内螺纹公差带；外螺纹公差带
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| A folk tale is a very old story that has been passed down from one family to another, from one generation to another. These old stories are often called fairy (神仙) stories because so many of them are about 1 . Every country has its own folk tales and its own 2 of telling fairy stories. In Germany, there lived two brothers, the Grimm (格林) brothers. They 3 folk tales. We know these stories 4 "Grimm's Fairy Tales'. Many of the tales told about the countries near Germany 5 they lived. Some of them were 6 The Grimm brothers did not 7 write the stories for boys and girls. They planned them for older people living in Germany. 8 when the children heard the stories, they wanted to hear them again and again. 9 of this happened long, long ago, but boys and girls everywhere still read and 10 Grimm's tales. | ||||
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