A.火弱 B.無(wú)火 C.觸點(diǎn)燒蝕
A.0.35~0.45 B.O.7~O.9 C.0.9~1.0 D.1.1~1.5
A.0.50~0.60 B.0.35~0.45 C.0.45~0.50