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当钢管作灯杆时,钢管内径不应小于多少？

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住宅集中给水龙头安装时,配件中心距地高度是()米.

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线槽敷线,绑扎点间距不应大于()m.

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The text is intended to show that ______.

A. we should accept life and mankind as it is
B. it is better to have an empathizing parent
C. everyone is determined by what he does
D. understanding life promotes right action

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幕墙既能够作为墙体的外装饰,又能够作为建筑的围护结构。()

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