单项选择题
A.0.1mm B.0.2mm C.0.3mm D.0.4mm
A.晶间腐蚀 B.延迟裂纹 C.应力腐蚀 D.热裂纹
A.10~30s B.30~60s C.50~80s D.60~100s
A.W B.H C.V D.R
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