2.
如图,直线m∥n,则90°-∠α为( )
0 284343 284351 284357 284361 284367 284369 284373 284379 284381 284387 284393 284397 284399 284403 284409 284411 284417 284421 284423 284427 284429 284433 284435 284437 284438 284439 284441 284442 284443 284445 284447 284451 284453 284457 284459 284463 284469 284471 284477 284481 284483 284487 284493 284499 284501 284507 284511 284513 284519 284523 284529 284537 366461
| A. | 70° | B. | 65° | C. | 50° | D. | 40° |