题目内容
(请给出正确答案)
[单选题]
中梁、侧梁下翼板、腹板及中梁下盖板麻点腐蚀直径大于()且深度大于原板厚度的()时堆焊或补强。
A.φ20mm,30%
B.φ20mm50%
C.φ30mm30%
D.φ30mm50%
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A.φ20mm,30%
B.φ20mm50%
C.φ30mm30%
D.φ30mm50%
A.8~10mm
B.10~12mm
C.10~15mm
D.15~20mm
A.20mm
B.30mm
C.40mm
D.50mm