对于两个集合对象set1,set2则执行set1>=set2的判断,含义是()
A. 测试是否set1是set2的子集
B. 测试是否set1是set2的超集
C. 判断是否set1的元素个数比set2的多
D. 判断是否set1的元素值比set2的大
列表[i*j for i in range(1,10) for j in range(1,10) if i==j]的值为:()
A. [1,2,3,4,5,6,7,8,9,10]
B. [1,2,3,4,5,6,7,8,9]
C. [1, 4, 9, 16, 25, 36, 49, 64, 81]
D. [1,2,4,3,6,9,4,8,12,16,5,10,15,20,25]