polar bonds definition Did you know that some types of chemical bonds behave similarly to the way that children play with toys? In this lesson, you will learn about two... 相關軟體 Polarity 下載 Netscape Navigator 網路瀏覽器 建構在Firefox2.0上的獨立型瀏覽器。 自動修正網址輸入錯誤的功能。 ... 了解更多 »