11.数x不小于3是指( )
| A. | x≤3 | B. | x≥3 | C. | x>3 | D. | x<3 |
8.某天的同一时刻,甲同学测得1m的测竿在地面上的影长为0.6m,乙同学测得国旗旗杆在地面上的影长为9.6m.则国旗旗杆的长为( )
| A. | 10m | B. | 12m | C. | 14m | D. | 16m |
5.已知b<0,a+b>0,那么a,b,-a,-b的大小关系是( )
0 286399 286407 286413 286417 286423 286425 286429 286435 286437 286443 286449 286453 286455 286459 286465 286467 286473 286477 286479 286483 286485 286489 286491 286493 286494 286495 286497 286498 286499 286501 286503 286507 286509 286513 286515 286519 286525 286527 286533 286537 286539 286543 286549 286555 286557 286563 286567 286569 286575 286579 286585 286593 366461
| A. | a>-b>-a>b | B. | -b>a>b>-a | C. | a>b>-a>-b | D. | a>-b>b>-a |