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【单选题】
组合面域是两个或多个现有面域的全部区域并合起来形成的;组合实体是两个或多个现有实体的全部体积合并起来形成的,这种操作称_____A.
INTERSECT（交集）
B.
UNION（并集）
C.
SUBTRACT（差集）
D.
INTERFERE（干涉）
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