台体的投影 有两面投影外轮廓一定是梯形框。 The projection of a frustum of pyramid must have

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台体的投影,有两面投影外轮廓一定是梯形框。 The projection of a frustum of pyramid must have two views having trapezoidal frames.

台体的投影 有两面投影外轮廓一定是梯形框。 The projection of a frustum of pyramid must have

热搜:垂直投影面积和水平投影面积的区别