[单选题]设R、S、T是集合A={a，b，c，d}上的关系，定义如下：R={<a,b>,<a,d>}S={<b,c>}T={<d,c>}计算（R◦S）∩（R◦T）=（ ）。
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2023-11-01 15:11:12|
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[单选题]设R、S、T是集合A={a，b，c，d}上的关系，定义如下：R={<a,b>,<a,d>}S={<b,c>}T={<d,c>}计算（R◦S）∩（R◦T）=（ ）。
A.{<a,c>}
B.Φ
C.{< a , b > , < a , d >，< b, c >, < d,c > }
D.{< a , b >, < a , d > }
A.{<a,c>}
B.Φ
C.{< a , b > , < a , d >，< b, c >, < d,c > }
D.{< a , b >, < a , d > }
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