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提问人:网友c********1 发布时间:2023年2月25日 16:11
[单项选择题]

水工岩质边坡喷射混凝土施工布置,喷射机安设位置与受喷面的水平垂直距离越近越好,若条件限制,水平距离也不得超过120m,垂直距离不得超过()。

A.20mB.30mC.40mD.50m

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