steel and rolled metal line icon. structural iron, construction industry, iron-metal, metal. - 鍍鋅 幅插畫檔、美工圖案、卡通及圖標鋼鐵廠, 符號
antique illustration, physics principles and experiments, electricity and magnetism: galvani's frog experiment - 鍍鋅 幅插畫檔、美工圖案、卡通及圖標青蛙, 電子元件
antique illustration, physics principles and experiments, electricity and magnetism: heat generation in galvanic battery - 鍍鋅 幅插畫檔、美工圖案、卡通及圖標
dark grey black colored vector backgrounds like grunge textured smudged rough rustic ribbed, rippled corrugated striped old cardboard or iron metal sheet with three dimensional narrow stripes or grooves all over and copy space - 鍍鋅 幅插畫檔、美工圖案、卡通及圖標黑色, 金屬