单项选择题
A.40℃ B.-50℃ C.-10℃ D.-16℃
A.前者不允许,后者裂纹宽度不应大于1mm B.后者不允许,前者裂纹宽度不应大于0.5mm C.前者裂纹宽度不应大于0.5mm,后者不应大于1mm D.前者和后者均不允许
A.-10.0 B.+10.0 C.±10.0 D.10.0
A.2.0 B.-2.0 C.+2.0 D.±2.0
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