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【单选题】
下列函数中,函数值恒为负值的是()。
A.
y=x
B.
y=-x2+1
C.
y=x2
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A.
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B.
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C.
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D.
who; which
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B.
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C.
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E.
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B.
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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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A.
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B.
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C.
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D.
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B.
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C.
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