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棱台上、下底面面积之比为1:9,则棱台的中截面分棱台成两部分的体积之比是( ) ...
棱台上、下底面面积之比为1:9,则棱台的中截面分棱台成两部分的体积之比是( )
A.1:7
B.2:7
C.7:19
D.5:16
考点分析:
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B.
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C.
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D.
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0.7,b=0.7
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1,F
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).
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1MF
2的面积.
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