9.不等式组$\left\{\begin{array}{l}{x+3>2}\\{1-2x≤-3}\end{array}\right.$的解集是( )
| A. | x≥2 | B. | -1<x≤2 | C. | x≤2 | D. | -1<x≤1 |
8.
五个大小相同的正方体搭成的几何体如图所示,其主视图是( )
| A. | B. | C. | D. |
7.-6的绝对值是( )
0 284093 284101 284107 284111 284117 284119 284123 284129 284131 284137 284143 284147 284149 284153 284159 284161 284167 284171 284173 284177 284179 284183 284185 284187 284188 284189 284191 284192 284193 284195 284197 284201 284203 284207 284209 284213 284219 284221 284227 284231 284233 284237 284243 284249 284251 284257 284261 284263 284269 284273 284279 284287 366461
| A. | -6 | B. | 6 | C. | $\frac{1}{6}$ | D. | -$\frac{1}{6}$ |