铸支托的厚度不得低于 ( )A.5.0mm B.0.8mnm C.3.0mm D.1.3mm E.0.5mm

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问题支托的厚度不得低于  (    )

选项 A.5.0mm
B.0.8mnm
C.3.0mm
D.1.3mm
E.0.5mm

答案D

解析
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