简述新闻批评“三字方针”的含义。
参考答案：
In the following statements about functional dependency, which one is incorrect
A．If X'
X, then X→X'.
B．If X→Y and Y'
Y, then X→Y'.
C．If X→Y and X'
X, then X'→
D．If X→Y and Y→Z, then X→
小额支付系统批量包（）包含具体的明细业务数据。
A、包头
B、包首
C、包体
D、包尾
X, then X→X'.
Y, then X→Y'.
X, then X'→