单项选择题
A.强度设计值下降 B.抗拉强度提高 C.可焊性提高 D.弹性模量降低
A.100mm B.160mm C.120mm D.140mm
A.0.7 B.0.8 C.0.75 D.0.85
A.100mm B.120mm C.140mm D.160mm且不小于层高的1/20
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