性爱无码高清电影|亚洲第一播放器|国产精品日日摸夜夜摸添孕妇|日本在线不卡免费|日韩A片大全在线观看|国产精品Av在线观看|欧美日韩另类一级二级|国产一区二区三区高清无码|成人网站在线观看视频|TS女神第一福利视频

Classification of alloy cored wire has the following 5 bases:

1.      According to sectional shape, it is divided into circular (wire diameter is 5-9mm) and rectangular (16mmｘ7mm、12mmｘ2mm).

2.      According to category of powder core, it is divided into single, compound, multiple single mixed;

3.      According to outgoing mode, it is divided into external type and internal- shaft type;

4.      According to shaping method, it is divided into lapping type, welding type and occlusion type;

5.      According to the status of the core material, it is divided into loose and integral 

• [Editor:張德眾]