A.10mm B.20mm C.30mm D.40mm
A.500-600℃ B.600-700℃ C.700-800℃ D.800-900℃
A.10s B.20s C.30s D.40s
A.20mm B.25mm C.28mm D.46mm
A.7.6 B.7.8 C.8 D.8.4
A.正火 B.淬火 C.回火 D.退火
A.普碳钢 B.C级钢 C.E级钢
A.300 B.350 C.400 D.450
A.4mm B.5mm C.6mm D.7mm
A.变形 B.腐蚀 C.破损 D.磨耗
