Most structural timber species now used in the North China's rural areas are poplar, willow, elm etc, which are fast growing trees but whose woods are very susceptible to biological deterioration.
我国北方农村的建筑用材，多以杨、柳、榆等速生树种为主，但这些木材易发生腐朽与虫蛀。
Timber structures-Strength graded structural timber with rectangular cross section-Part 2: Machine grading;
木结构 按强度分类的矩形截面承重木料 第2部分：机械分选；
Timber structures-Strength graded structural timber with rectangular cross section-Part 2: Machine grading;
木结构 按强度分类的矩形截面承重木料 第2部分：机械分选；
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