给出下列四个命题，其中正确的命题有个．（1）函数上的单调递增

给出下列四个命题，其中正确的命题有个．
（1）函数上的单调递增区间是；
（2）均为非零实数，集合，则“”是“”的必要不充分条件
（3）若为真命题，则也为真命题
（4）命题的否定

A．

B．

C．

D．

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