单项选择题
A.2B.3C.4D.5
A.30mm*30mm*4mmB.30mm*40mm*4mmC.40mm*50mm*5mmD.40mm*60mm*5mm
A.30mm*4mmB.40mm*4mmC.50mm*5mmD.60mm*5mm
A.13B.15C.17D.19
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