6.下列运算中正确的是( )
0 285394 285402 285408 285412 285418 285420 285424 285430 285432 285438 285444 285448 285450 285454 285460 285462 285468 285472 285474 285478 285480 285484 285486 285488 285489 285490 285492 285493 285494 285496 285498 285502 285504 285508 285510 285514 285520 285522 285528 285532 285534 285538 285544 285550 285552 285558 285562 285564 285570 285574 285580 285588 366461
| A. | $\sqrt{2}+\sqrt{3}=\sqrt{5}$ | B. | $\sqrt{3}×\sqrt{7}=\sqrt{10}$ | C. | $\sqrt{8}÷\sqrt{2}=2$ | D. | $\sqrt{(-6)^{2}}=-6$ |