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【判断题】
楼梯的允许坡度范围应在23°~45°之间
A.
正确
B.
错误
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A.
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B.
封闭环
C.
增环
D.
减环
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A.
正确
B.
错误
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A.
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B.
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A.
正确
B.
错误
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A.
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B.
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C.
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D.
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