When other elements—such as manganese, molybdenum, nickel, vanadium, silicon, lead, chromium, boron, tungsten, or sulfur—are mixed in, steel becomes not just hard or soft but strong, tough, ductile, corrosion resistant, machinable, flexible, magnetic, nonmagnetic—and the list goes on.
চারটি নির্দিষ্ট বিন্দু দিয়ে অঙ্কিত সমভূজ হাইপারবোলাjw2019 jw2019