5.若点P(x,y)在第三象限,且点P到x轴的距离为3,到y轴的距离为2,则点P的坐标是( )
| A. | (-2,-3) | B. | (-2,3) | C. | (2,-3) | D. | (2,3) |
19.下列说法正确的是( )
0 294326 294334 294340 294344 294350 294352 294356 294362 294364 294370 294376 294380 294382 294386 294392 294394 294400 294404 294406 294410 294412 294416 294418 294420 294421 294422 294424 294425 294426 294428 294430 294434 294436 294440 294442 294446 294452 294454 294460 294464 294466 294470 294476 294482 294484 294490 294494 294496 294502 294506 294512 294520 366461
| A. | 若一组数据x1,x2,x3的方差为1,则另一组数据2x1,2x2,2x3的方差为4 | |
| B. | 调查某批次汽车的抗撞击能力,应选择全面调查 | |
| C. | 中位数就是一组数据中最中间的一个数 | |
| D. | 8,9,9,10,10,11这组数据的众数是10 |