9.把1克盐放入4克水中,盐水的含盐率是( )
| A. | 10% | B. | 20% | C. | 40% | D. | 50% |
8.用同样长的铁丝围成正方形、长方形和圆形.则围成的图形( )的面积最大.
| A. | 正方形 | B. | 长方形 | C. | 圆形 | D. | 一样大 |
7.甲数是100,乙数是80,那么甲数比乙数多( )
0 136287 136295 136301 136305 136311 136313 136317 136323 136325 136331 136337 136341 136343 136347 136353 136355 136361 136365 136367 136371 136373 136377 136379 136381 136382 136383 136385 136386 136387 136389 136391 136395 136397 136401 136403 136407 136413 136415 136421 136425 136427 136431 136437 136443 136445 136451 136455 136457 136463 136467 136473 136481 199269
| A. | 20% | B. | 25% | C. | 50% | D. | 80% |