单项选择题
内壁有台阶的盘扣式支撑架连接外套管长度应不小于(),可插入长度应不小于()。
A.80mm,70mm
B.90mm,75mm
C.150mm,100mm
D.200mm,100mm
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单项选择题
A.80mm,70mm
B.90mm,75mm
C.150mm,100mm
D.200mm,100mm
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