12.
如图,下列说法正确的是( )
0 306973 306981 306987 306991 306997 306999 307003 307009 307011 307017 307023 307027 307029 307033 307039 307041 307047 307051 307053 307057 307059 307063 307065 307067 307068 307069 307071 307072 307073 307075 307077 307081 307083 307087 307089 307093 307099 307101 307107 307111 307113 307117 307123 307129 307131 307137 307141 307143 307149 307153 307159 307167 366461
| A. | 当y1<y2时,自变量x的取值范围不能确定 | |
| B. | 当y1<y2时,-1<x<3 | |
| C. | 当y1<y2时,-1≤x≤3 | |
| D. | 当y1<y2时,x<-1或x>3 |