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量得圓的半徑分別為:2釐米和1釐米,則2÷120=40(釐米),1÷120=20(釐米),3.14×(402-202),=3.14×(1600-400),=3.14×1200,=3768(平方釐米);答這個零件截面的實際面積是3768平方釐米.
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