Piling steel pipe, also known as drill pipe, is transcribed, or strip steel plate riveted through the coil after forming the pipes lead.
是用誊写钢版或者带钢通过卷曲成型后铆接酿成的钢管。
Piling steel pipe, also known as drill pipe, is transcribed, or strip steel plate riveted through the coil after forming the pipes lead.
是用誊写钢版或者带钢通过卷曲成型后铆接酿成的钢管。
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