A:he regretted to have refused his father's kiss
B:he wanted to remind us to cherish the time with family
C:he still thought this was the most embarrassing thing
D:he understood his father's love and missed him
①要在心灵深处憎恶违法犯罪 ②要坚决打击违法犯罪
③要在行为上远离违法犯罪 ④要从小事做起,预防违法犯罪
下列命题中:
①若集合A={x|kx2+4x+4=0}中只有一个元素,则k=1;
②已知函数y=f(3x)的定义域为﹣1,1,则函数y=f(x)的定义域为(﹣∞,0);
③函数y=11-x在(﹣∞,0)上是增函数;
④方程2|x|=log2(x+2)+1的实根的个数是2.
所有正确命题的序号是____ (请将所有正确命题的序号都填上)
有关纬线的叙述,正确的是( )