题目8A. 五元组(K,∑,f,S,Z)B. 四元组(Vn,Vt,P,S)C. 三元组(Vn,Vt,P)D. 四元组(K,∑,f,S)
题目10单选题
如下图所示,e-closure({3,4,5})=( ).<img src="https://tihai-oss-cloud.itihey.com/img/f58ce07e3ea769c57ab9bc3e4e3e9a3f.png">A. {3,4,5}B. {1,2,3,4,5,6,7,8}C. {2,3,4,5,6,7,8}D. {1,3,4,5,6,7,8}