covid-19 rapid diagnostic test kit with hand holding pipette and placing sample on test cassette. - 試藥 幅插畫檔、美工圖案、卡通及圖標水滴, 冠狀病毒
illustration of pure hydrogen catalytically reacted with pure nitrogen in compressor to form anhydrous liquid ammonia in haber-bosch process - 試藥 幅插畫檔、美工圖案、卡通及圖標動作
illustration of chloralkali process where electrolysis separates chloride and hydroxide from sodium and hydrogen to form sodium hydroxide - 試藥 幅插畫檔、美工圖案、卡通及圖標分離, 動作
illustration of lead acid car battery showing lead dioxide plate, lead plate and sulphuric acid - 試藥 幅插畫檔、美工圖案、卡通及圖標