6.在平面直角坐标系中,⊙P的半径是2,点P(0,m)在y轴上移动,当⊙P与x轴相交时,m的取值范围是( )
| A. | m<2 | B. | m>2 | C. | m>2或m<-2 | D. | -2<m<2 |
3.如果y=(a+1)x${\;}^{{a}^{2}}$是正比例函数,那么a的值是( )
0 290920 290928 290934 290938 290944 290946 290950 290956 290958 290964 290970 290974 290976 290980 290986 290988 290994 290998 291000 291004 291006 291010 291012 291014 291015 291016 291018 291019 291020 291022 291024 291028 291030 291034 291036 291040 291046 291048 291054 291058 291060 291064 291070 291076 291078 291084 291088 291090 291096 291100 291106 291114 366461
| A. | -1 | B. | 0或1 | C. | -1或1 | D. | 1 |