有的胶合板是将两个不同纹路的单板贴在一起制成的，所以在选择上要注意夹板拼缝处应严密，工字钢标准，没有高低不平现象。挑选胶合板时，应注意挑选不散胶的胶合板。如果手敲胶合板各部位时，声音发脆，则证明质量良好，若声音发闷，则表示胶合板已出现散胶现象。

Some plywood plywood is made of two different lines of the single board together， so in the choice of the splints should be careful to pay attention to the joint， there is no uneven phenomenon. When choosing plywood， you should pay attention to selecting plywood without glue. If the hand knocks on the plywood parts， the sound is crisp， which proves that the quality is good. If the voice is stuffy， it means that the plywood has already appeared loose glue phenomenon.

胶合板是由三层或多层一毫米左右的实木单板或薄板胶贴热压制成，常见的有三夹板、五夹板、九夹板和十二夹板（俗称三合板，工字钢，五厘板，九厘板，十二厘板）。

Plywood is made of three or more than one millimeter of solid wood veneer or thin plate with hot pressing. There are three splints， five splints， nine splints and twelve splints (commonly known as three plywood， five millimeter，工字钢哪家好， nine millimeter， twelve millimeter).

合金元素与铁、碳的相互作用

合金元素加入钢中后，主要以三种形式存在钢中。即：与铁形成固溶体；与碳形成碳化物；在高合金钢中还可能形成金属间化合物。

The interaction of alloying elements with iron and carbon

When alloy elements are added to steel， they mainly exist in three forms. Namely: to form a solid solution with iron; carbide and carbon; in high alloy steels are also likely to form intermetallic compounds.

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