认清人造薄木贴面与天然木质单板贴面的区别。前者的纹理基本为通直纹理，圣霖国际工字钢多少钱，纹理图案有规则；而后者为天然木质花纹，圣霖国际工字钢，纹理图案自然变异性比较大，无规则。
Recognize the difference between man-made veneer overlay and natural veneer veneer. The texture of the former is basically straight texture， and the texture pattern is regular. The latter is natural wood pattern，圣霖国际工字钢生产商， and the natural variability of texture pattern is large and irregular.
①胶合板有正反面的区别。挑选时，胶合板要木纹清晰，正面光洁平滑，不毛糙，要平整无滞手感。
②胶合板不应有*损、碰伤、硬伤、疤节等疵点。
1.the difference between the plywood and the and negative sides. When selecting， plywood should be clear， **ooth， **ooth， and **ooth.
2. Plywood should not be damaged， bruised，圣霖国际工字钢厂， hard or scarred.
H型钢是一种断面力学性能较工字钢优良的经济型断面钢材，因其断面的形状与英文字母“H”相同而得名。热轧H型钢的翼缘比工字钢宽、侧向刚度大、抗弯能力强。同等规格下H型钢理重较工字钢轻。
H steel is a kind of economical section steel with better section mechanical properties than that of I-steel. Because the shape of the section is the same as that of the English letter "H". The flange of hot rolled H steel is wider than that of I-steel， large lateral stiffness and strong bending resistance. Under the same specification， the weight of H steel is lighter than that of I-steel.
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