A:when was it that
B:that it was whe
C:where it was that
D:it was where that
____
①函数f(x)在x>0时是增函数,x<0也是增函数,所以f(x)是增函数;
②正比例函数的图象一定通过直角坐标系的原点;
③若函数f(x)的定义域为0,2,则函数f(2x)的定义域为1,2;
④y=x2﹣2|x|﹣3的递增区间为1,+∞).
其中正确命题的序号是____.(填上所有正确命题的序号)
____,偭规矩而改错 。背绳墨以追曲兮,____。