A.將斷股處磨平用同材質(zhì)的綁線扎緊 B.進(jìn)行補(bǔ)強(qiáng) C.鋸斷做接頭 D.更換
A.1/10 B.1/5 C.1/4 D.1/3
A.0.1mm B.0.2mm C.0.3mm D.0.5mm