题目
下列结论错误的是 ( ) A.命题“若p,则q”与命题“若,则”互为逆否命题 B.命题q:∃x∈R,sinx-cosx=。则¬q是假命题 C.为得到函数y=sin(2x-)图象,只需把函数y=sin(2x+)的图象向右平移个长度单位 D.若函数的导数为,为的极值的充要条件是You can't eat _____ before _____ your hands.
[ ]A. something ; washB. anything ; washingC. anything ; washD. something ; washing