chem 有d bonding 要畫 out from the paper 同 into the paper
out of paper 洗唔洗一定畫實心三角形,空心得唔得架
into paper 洗唔洗一完要虛線三角形,就咁一條直ge 虛線又得唔得
收錄日期: 2021-04-13 16:10:56
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https://hk.answers.yahoo.com/question/index?qid=20080109000051KK04366