透过露珠看叶脉会更清晰这是由于露珠相当于“凸透镜 叶脉位于“凸透镜 的 A.焦距以内b.焦距和二倍焦距之间c.二倍焦距处d.二倍焦距 Template




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tomski透过露珠看叶脉会更清晰这是由于露珠相当于“凸透镜 叶脉位于“凸透镜 的 coloring