A.6in B.10in C.12in D.15in
A.6cm B.10cm C.12cm D.15cm
A.數(shù)字的上緣為準(zhǔn) B.數(shù)字的中間為準(zhǔn) C.數(shù)字的下緣為準(zhǔn) D.兩相鄰數(shù)字的中間為準(zhǔn)