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立井基岩施工时,用作井筒永久支护工作平台的设施称为:()

单选题
2021-07-19 06:47
A、天轮平台
B、封口盘
C、固定盘
D、吊盘
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正确答案
D

试题解析
D

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立井基岩施工时,用作井筒永久支护工作平台的设施称为:()
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