the length of a sperm whale's tooth is 20 cm

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• whale's tooth of the a sperm length is 50cm
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• the length of a sperm whale's tooth is ( ) cm 这是什么意思.急!急!急!
• 20cm of a sperm whale's the length tooth is [连词成句
• whale's tooth of the a sperm length is 50cm
• the length of a sperm whale's tooth is 20 cm如何对20CM提问?
• 连词成句：whale's tooth of the a sperm length is 50cm
• The_______ of a sperm whaie's tooth is 20 cm.A.long B.length C.longer
• the length of a sperm whale's tooth is 20 cm
• the length of a sperm whale's tooth is ( ) cm 这是什么意思.急!急!急!
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• 在探究“凸透镜成像”规律的实验时： （1）先组装器材，调节烛焰、透镜、光屏，即使它们的中心在_．这样做的目的是_． （2）在未知焦距情况下，要粗测焦距，方法是_． （3）若在实验