题目内容
满足M{a1, a2, a3, a4},且M∩{a1 ,a2, a3}={ a1,a2}的集合M的个数是 ( )
A.1 B.2 C.3 D.4
B
(A)1 (B)2 (C)3 (D)4
满足M{a1, a2, a3, a4},且M∩{a1 ,a2, a3}={ a1,a2}的集合M的个数是( )
A.1 B.2 C.3 D.4
(山东卷理1文1)满足M{a1, a2, a3, a4},且M∩{a1 ,a2, a3}={ a1·a2}的集合M的个数是( )