A.0.02d+5mm B.0.015d+3.5mm C.0.03d+7.5mm D.0.01d+2mm
A.≥0.01d+2mm B.≥0.015d+3.5mm C.≥0.02d+5mm D.≥0.03d+7.5mm
A.退火 B.淬火+低溫回火 C.淬火+高溫回火 D.正火