19.
如图,AB=AC,CD⊥AB于D,BE⊥AC于E,则图中全等的三角形对数为( )
| A. | 1对 | B. | 2对 | C. | 3对 | D. | 4对 |
16.等腰三角形的底边长为5cm,一腰上的中线把周长分成的两部分之差为4cm,则腰长为( )
0 309361 309369 309375 309379 309385 309387 309391 309397 309399 309405 309411 309415 309417 309421 309427 309429 309435 309439 309441 309445 309447 309451 309453 309455 309456 309457 309459 309460 309461 309463 309465 309469 309471 309475 309477 309481 309487 309489 309495 309499 309501 309505 309511 309517 309519 309525 309529 309531 309537 309541 309547 309555 366461
| A. | 1cm | B. | 9cm | C. | 1cm或9cm | D. | 以上都不对 |