发布时间:2025-02-05 08:47:16
从水准仪的目镜里可以观察到镜筒前端有三根横向的细线,中间的那根一般最长是我们一般正常观测水准尺读数的,它的上下各有一根短线,测量两点间的距离时用上面短线读数减去下面短线的读数再乘以100即为你所要的结果。
想在淘宝买樟木条就是防虫防潮的那种由于夏天慢慢来了所以需要那个不知怎样鉴别真假樟木条
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