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【单选题】
下列不等式中,是一元一次不等式的是 [     ]
A.
+1>2
B.
x 2 >9
C.
2x+y≤5
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A.
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A.
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B.
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A.
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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.
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B.
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C.
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D.
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E.
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A.
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C.
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D.
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