6.下列二次根式中,与$\sqrt{8}$是同类二次根式的是( )
0 283568 283576 283582 283586 283592 283594 283598 283604 283606 283612 283618 283622 283624 283628 283634 283636 283642 283646 283648 283652 283654 283658 283660 283662 283663 283664 283666 283667 283668 283670 283672 283676 283678 283682 283684 283688 283694 283696 283702 283706 283708 283712 283718 283724 283726 283732 283736 283738 283744 283748 283754 283762 366461
| A. | $\sqrt{2}$ | B. | $\sqrt{3}$ | C. | $\sqrt{5}$ | D. | $\sqrt{6}$ |