This article introduces four common surface treatments for bolts: coating, hot-dip galvanizing, electroplating, and Dacro. These methods can improve the…
BMT Bosh Assambleyasining 75-sessiyasida 2020, Xitoy "karbonat angidrid chiqindilari eng yuqori cho'qqisiga chiqishi kerak" deb taklif qildi 2030 and achieve…