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设区域V:x2+y2+z2≤R2,则=()。

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A  B  C  D  
ρ={R1(WY),R2(XZ)}   ρ={R1(WZ),R2(XY)}   ρ={R1(WXY),R2(XZ)}   ρ={R1(WX),R2(YZ)}  
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