.Do you like _____ with your parents?[ ]
A. chatting
B. chating
C. chats
D. chat
A
非变形腈纶长丝单纱(捻度为100转/m)
设有关系R(A,B,C),其函数依赖集F=A→B,B→C,则关系R在函数依赖的范畴内最多满足
A) 1NF B) 2NF C) 3NF D) BCNF