发布时间:2025-01-30 19:52:34
量最近支点的距离。比如板搭在梁上,梁之间的距离就是板的跨度;梁架在柱上,柱距就是梁跨;次梁架在主梁上,主梁之间的距离就是次梁的跨度。
一根圆柱形有机玻璃棒体积是400立方厘米底面积是4立方厘米把它平均截成5段每段长 cm
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