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【单选题】
20层建筑物的建筑燃气工程高层建筑增加人工费的8%。如果有某20层民用建筑燃气安装的直接工程50000,其中人工3500元,其高层建筑增加( )元。A.
3500
B.
280
C.
4000
D.
50000
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A.
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B.
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C.
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D.
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A.
tax
B.
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C.
interest
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