工字钢也称为钢梁（英文名称 I Beam)，是截面为工字形状的长条钢材。工字钢分普通工字钢和轻型工字钢，H型钢三种。工字钢广泛用于各种建筑结构、桥梁、车辆、支架、机械等。
I-steel beam (also known as English name I Beam), is an H-shaped steel strip section. I-steel is divided into three kinds: ordinary I-steel and light I-steel, H type steel. I-steel is widely used in various architectural structures, bridges, vehicles, stents, machinery and so on.
板材是指一般的压型钢板\平板等,都是较薄的钢板,通常都作为屋面或围护墙等用型材是指热轧的\冷弯的如工字钢\H钢\C型钢Z型钢,通常都作主结构用。
Plate refers to the general profiled steel plate, flat plate, etc., which are thin steel plates, usually used as roofing or retaining walls.
Profiles refer to hot rolled cold-formed ones, such as I-steel, \H steel, \C steel and Z section steel, which are usually used for main structure.
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胶合板不应有破损、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, hard or scarred.