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【单选题】
已知函数 y= k x ,当x=1时,y=-3,那么这个函数的解析式是(  )
A.
y= 3 x
B.
y= -3 x
C.
y=3x
D.
y=-3x
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A.
B
B.
D
C.
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D.
A
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A.
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B.
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D.
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A.
mine
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A.
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