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2013-05-23 12:21
求翻译：Trusses used to support roofs are selected on the basis of the span, the slope, and the roof material. Some of the more common types of trusses used are shown in Fig. 3–3. In particular, the scissors truss, Fig. 3–3a, can be used for short spans that require overhead clearance. The Howe and Pratt trusses, Figs. 3–3b an是什么意思？ 待解决
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Trusses used to support roofs are selected on the basis of the span, the slope, and the roof material. Some of the more common types of trusses used are shown in Fig. 3–3. In particular, the scissors truss, Fig. 3–3a, can be used for short spans that require overhead clearance. The Howe and Pratt trusses, Figs. 3–3b an
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