全省VIP客户划分为哪几个级别?()
A.全球通钻卡;
B.全球通金卡;
C.全球通银卡;
D.普通VIP客户;
参考答案:A, B, C
设集合S={A0,A1,A2},在S上定义运算⊕:Ai⊕Aj=Ak,其中k为i+j被3除的余数,i,j∈{1,2,3},则使关系式(Ai⊕Aj)⊕Ai=A0成立的有序数对(i,j)总共有( )
A.1对
B.2对
C.3对
D.4对
Have you read the story ________ facts in the magazine?[ ]
A. founding on
B. founded on
C. found upon
D. finding on