6.
实数a,b在数轴上的位置如图,且a=-$\sqrt{2}$,b=$\sqrt{3}$,则化简$\sqrt{{a}^{2}}$-$\sqrt{{b}^{2}}$-|a-b|的结果为( )
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| A. | -2$\sqrt{2}$ | B. | -2$\sqrt{3}$ | C. | 0 | D. | 2$\sqrt{3}$ |