单项选择题
焊接钢管外径和壁厚尺寸的允许偏差分别是()
A.±0.5mm,±0.36mm
B.±0.4mm,±0.35mm
C.±0.6mm,±0.36mm
D.±0.5mm,±0.35mm
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单项选择题
A.±0.5mm,±0.36mm
B.±0.4mm,±0.35mm
C.±0.6mm,±0.36mm
D.±0.5mm,±0.35mm
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