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According to national standard, which of the following are preferred scales? Which of the following are the projection rules of the projections of points？ A:3：1 B:4：1 C:2：1 D:5：1 答案: 2：1; 5：1 A:The frontal projection and the profile projection of the same point should be aligned horizontally. B:The frontal projection and the horizontal projection of the same point should be aligned vertically. C:The horizontal projection and the profile projection of the same point have the same width coordinate. 答案: The frontal projection and the profile projection of the same point should be aligned horizontally.; The frontal projection and the horizontal projection of the same point should be aligned vertically.; The horizontal projection and the profile projection of the same point have the same width coordinate.
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