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量角器

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角度學習器360度（學生用） Angle learning 360 degree protractor for pupil
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360°全圓量角器(學生用）Protractor 360° for student
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180°半圓量角器(學生用） Protractor 180° for student
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教學量角器（有手柄）Teaching protractor with handle
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透明磁性指針教學量角器（有手柄）Magnetic teaching Protractor with indicator
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