在北美地区，我们可以关注一些常见的松科植物，包括Pine（松）、Fir（冷杉）、Spruce（云杉）、Larch（落叶松）、Hemlock（铁杉）、以及Douglas Fir（黄杉）。这些植物的俗名与它们所属的属相对应，且在北美地区相对常见。在区分这些植物时，我们可以通过观察叶子的数量、形状、与枝条的连接方式、球果的形态等...
Pine 松（Pinus ）Fir 冷杉（Abies ）Spruce 云杉（Picea ）Larch落叶松（Larix ）Hemlock铁杉...
Pine 松（Pinus ）Fir 冷杉（Abies ）Spruce 云杉（Picea ）Larch落叶松（Larix ）Hemlock铁杉...
该树种组合包括结构参数相似的树种, 即美国西部的恩氏云杉、西加云杉和黑松以 及美国东北部的香脂冷杉、短叶松、红松和其 他种类云杉。云杉-松-冷杉(南方)适用于一 般构架用途。在高级结构性轻型构架等级中, 特定尺寸的木制品适用于轻型桁架及其他工 程应用。
Learn about Canfor’s spruce-pine-fir lumber products and specifications such as species, sizes, grades, packaging and shipping.
2001. Nitric acid dry deposition to conifer forests: Niwot Ridge spruce-fir-pine study. Atmospheric Environment 35:3851-3859.Sievering, H., Kelly, T., McConville, G., Seibold, C., and Turnipseed, A.: Nitric acid dry deposition to conifer forests: Niwot Ridge spruce-fir-pine study, ...
pine, fir, spruce - Pine, fir, and spruce are quite different from each other, though they are all conifers; pine has clusters of long, needle-shaped leaves, spruce is a type of fir, and the only scientific difference between the two is that spruces have rectangular needles while firs ...
Spruce- Pine-Fir Lumber 青云英语翻译 请在下面的文本框内输入文字,然后点击开始翻译按钮进行翻译,如果您看不到结果,请重新翻译! 翻译结果1翻译结果2翻译结果3翻译结果4翻译结果5 翻译结果1复制译文编辑译文朗读译文返回顶部 云杉- 松木 - 冷杉木材 翻译结果2复制译文编辑译文朗读译文返回顶部...
Engineering Properties of Visually Graded Structural Lumber Douglas-Fir-Larch, Hem-Fir, Spruce-Pine-Fir. Stress-graded structural lumber is produced under two systems: visual grading and machine grading. Visual structural grading is the oldest stress grading system. It is based on the premise that ...
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