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【单选题】
潜在形式的过剩人口主要是指( )。A.
大城市中的失业人口
B.
过剩的农村人口
C.
、城市中的在业人口
D.
城市中就业时而就业时而失业的人口
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B.
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C.
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D.
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B.
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A.
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B.
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C.
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