在剖视图中,当剖切平面通过齿轮的轴线时,轮齿一律按不剖绘制。( )
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填空 判断划线部分数字的书写形式正确与否,正确填写T,错误填写正确写法。This distance is about five trillion eight hundred seventy-eight billion miles.
填空 判断划线部分数字的书写形式正确与否,正确填写T,错误填写正确写法。A light-year is a unit of length equal to the distance that light travels in 1 year.
填空 判断划线部分数字的书写形式正确与否,正确填写T,错误填写正确写法。Many children aged six to 18 contributed aid to victims.
填空 判断划线部分数字的书写形式正确与否,正确填写T,错误填写正确写法。Three billion dollars in aid was provided by world countries.