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按《房屋建筑制图统一标准》(GBJ 1-86)(以下简称《标准》),2~(1/2)在建筑工程制图中有多处应用,现举例说明如下。1.《标准》中第3.0.1条规定:“图线的宽度6,应从下列线宽系列中选取:0.18、0.25、0.35、0.5、0.7、1.0、1.4、2.0mm”。如选用表3.0.1中线宽比为 b 时,线宽组中有2.0mm、1.4mm。1.4×2~(1/2)=2.0,余下按比值为2~(1/2)均可类此推算,故只要能记住0.35mm 这个数据,便能推算出其他的线
According to “Unified Standard for Housing Construction Drawing” (GBJ 1-86) (hereinafter referred to as “Standard”), 2~(1/2) has several applications in the construction engineering drawing. 1. Article 3.0.1 of the “Standards” states: “The width of the diagram line should be selected from the following line width series: 0.18, 0.25, 0.35, 0.5, 0.7, 1.0, 1.4, 2.0mm”. If the ratio of line width to b in Table 3.0.1 is selected, there are 2.0mm and 1.4mm in the line width group. 1.4 × 2 ~ (1/2) = 2.0, the remaining ratio of 2 ~ (1/2) can be calculated by analogy, so long as you can remember the data of 0.35mm, you can calculate other lines