空中和地面的威胁以不同的符号来代表，与色彩相配合，增强飞行员的理解和势态感知。
The symbols representing air and ground threats appear in different shapes that, along with the colors, enhance the pilot's comprehension and situational awareness.
指示凹焊缝、凸焊缝或平焊。增加高度以配合其他焊接符号。
Indicates concave, convex or flush welds. Increase height to fit above other weld symbol.
并能正确标注尺寸及加工表面符号，公差与配合。
Learning to mark dimensions, manufacturing surface symbols tolerance and fittings correctly.
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