14.
如图是一个可以自由转动的正六边形转盘,其中三个正三角形涂有阴影.转动指针,指针落在有阴影的区域内的概率为a;投掷一枚硬币,正面向上的概率为b.关于a,b大小的正确判断是( )
| A. | a>b | B. | a<b | C. | a=b | D. | 不能判断 |
13.函数y=$\sqrt{x+1}$中自变量x的取值范围是( )
| A. | x>-1 | B. | x≥-1 | C. | x<-1 | D. | x≤-1 |
12.比-2小1的数是( )
0 294345 294353 294359 294363 294369 294371 294375 294381 294383 294389 294395 294399 294401 294405 294411 294413 294419 294423 294425 294429 294431 294435 294437 294439 294440 294441 294443 294444 294445 294447 294449 294453 294455 294459 294461 294465 294471 294473 294479 294483 294485 294489 294495 294501 294503 294509 294513 294515 294521 294525 294531 294539 366461
| A. | -1 | B. | -3 | C. | 1 | D. | 3 |