题目内容
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[单选题]
CRTSⅡ型板式无砟轨道底座板砼浇筑时,钢板连接器中锚固和锁紧螺母应旋开,其距钢板的最小距离在常规区和临时端刺区分别为()
A.20mm和50mm
B.30mm和70mm
C.50mm和100mm
D.40mm和90mm
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A.20mm和50mm
B.30mm和70mm
C.50mm和100mm
D.40mm和90mm