1. Kutenga kunoda kunzwisisa mhando dzepombi dzesimbi: A. Yakakamurwa nemhando: yakatwasuka seam simbi pombi, seamless simbi pombi, spiral simbi pombi, etc. B. Kukamurwa kwe-cross-section shapes ye straight seam steel pipes: square pombi, rectangular pombi, elliptical pombi, flat ellipse pipe, semicir...
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