题目内容
【单选题】正等轴测投影图的轴间角均为120°,简化轴向伸缩系数均为1。
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【填空题】坐标轴OX、OY、OZ在轴测投影面上的投影O1X1、O1Y1、O1Z1简称轴测轴;每两根轴测轴之间的夹角∠X1O1Y1、∠X1O1Z1、∠Y1O1Z1,称为____角。
From the sentence "And then, after 6 years, she saw him again. ", we can infer that the two characters had not seen each other for 6 years.
The man was very self-centered.
Why did the man frown when he saw the woman?
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