9.
如图所示的圆柱体从左面看是( )
| A. | B. | C. | D. |
6.
如图,直线AB、CD交于点O,OT⊥AB于点O,EF∥AB交CD于点C.若∠FCO=50°,则∠DOT等于( )
| A. | 50° | B. | 45° | C. | 40° | D. | 60° |
5.若代数式2y2+3y+7的值为12,则代数式6y+4y2+9的值为( )
0 279493 279501 279507 279511 279517 279519 279523 279529 279531 279537 279543 279547 279549 279553 279559 279561 279567 279571 279573 279577 279579 279583 279585 279587 279588 279589 279591 279592 279593 279595 279597 279601 279603 279607 279609 279613 279619 279621 279627 279631 279633 279637 279643 279649 279651 279657 279661 279663 279669 279673 279679 279687 366461
| A. | 23 | B. | 19 | C. | 29 | D. | 24 |