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According to the international rule, the table tennis game is played with a sphere having a mass of 2.7 g and a diammiter of _____. ( )

According to the international rule, the table tennis game is played with a sphere having a mass of 2.7 g and a diammiter of _____. ( )
A.38 mm
B.40 mm
C.48mm
D.50 mm
正确答案：40 mm

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