A.6% B.10% C.15% D.18%
A.12-1.5 kgf/cm B.1.5-1.8 kgficm C.1.8-2.0 kgf/cm D.2.0-2.5 kgf/cm
A.10 kgf/cmi B.30 kgf/cmz C.50 kgf/cmz D.75 kgf/cmZ