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光学尺SINO KA300SW2021K-300-70K-300-120K-300-170K-300-220K-300-270K-300-320K-300-370K-300-420K-300-470K-300-520K-300-570K-300-620K-300-670K-300-720K-300-770K-300-820K-300-870K-300-920K-300-970K-300-1020