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【单选题】
过z轴和点(1,2，-1)的平面方程是( )。A.
x+2y-z-6=0
B.
2x-y=0
C.
y+2z=0
D.
x+z=0
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A.
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B.
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C.
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D.
无
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A.
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B.
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A.
three
B.
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C.
two
D.
five
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