14.
如图,a∥b,下列结论中正确的是( )
0 285415 285423 285429 285433 285439 285441 285445 285451 285453 285459 285465 285469 285471 285475 285481 285483 285489 285493 285495 285499 285501 285505 285507 285509 285510 285511 285513 285514 285515 285517 285519 285523 285525 285529 285531 285535 285541 285543 285549 285553 285555 285559 285565 285571 285573 285579 285583 285585 285591 285595 285601 285609 366461
| A. | ∠1=∠2 | B. | ∠1+∠2=180° | C. | ∠1=∠3 | D. | ∠1+∠3=180° |