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【单选题】
吊杆安装距离，上人顶和不上人顶距离一般为多少？
A.
上人顶为800-1000mm，不上人顶为1200-1500mm
B.
上人顶为800-1000mm，不上人顶为1000-1200mm
C.
上人顶为900-1200mm，不上人顶为1000-1500mm
D.
上人顶为900-1200mm，不上人顶为1200-1500mm
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参考解析：
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A.
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B.
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C.
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D.
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