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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合并起来形成的；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，这种操作的命令是（）。
A.
INTERSECT
B.
UNION
C.
SUBTRACT
D.
SUBTRACTION
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