A.8cm;放層勢(shì) B.10cm;拉緊 C.10cm;放層勢(shì) D.8cm;拉緊
A.6.5cm B.7cm C.7.5cm D.8cm
A.15﹕3.5 B.15﹕2.5 C.15﹕3 D.15﹕2