9.若$\sqrt{{a}^{2}}=(\sqrt{a})^{2}$,则a的取值范围是( )
| A. | a≥0 | B. | a≠0 | C. | a<0 | D. | a为任意实数 |
7.
如图,已知直线CD∥AB,若∠DFE=130°,则∠ABE的度数为( )
0 282138 282146 282152 282156 282162 282164 282168 282174 282176 282182 282188 282192 282194 282198 282204 282206 282212 282216 282218 282222 282224 282228 282230 282232 282233 282234 282236 282237 282238 282240 282242 282246 282248 282252 282254 282258 282264 282266 282272 282276 282278 282282 282288 282294 282296 282302 282306 282308 282314 282318 282324 282332 366461
| A. | 30° | B. | 50° | C. | 60° | D. | 130° |