已知两个非零向量 $\stackrel{\rightharpoonup }{a},\stackrel{\rightharpoonup }{b}$满足 $\left|\stackrel{\rightharpoonup }{a}+\stackrel{\rightharpoonup }{b}\right|=\left|\stackrel{\rightharpoonup }{a}-\stackrel{\rightharpoonup }{b}\right|$，则下面结论正确的是

A．	$\stackrel{\rightharpoonup }{a}//\stackrel{\rightharpoonup }{b}$	B．	$\stackrel{\rightharpoonup }{a}\perp \stackrel{\rightharpoonup }{b}$
C．	$\left|\stackrel{\rightharpoonup }{a}\right|=\left|\stackrel{\rightharpoonup }{b}\right|$	D．	$\stackrel{\rightharpoonup }{a}+\stackrel{\rightharpoonup }{b}=\stackrel{\rightharpoonup }{a}-\stackrel{\rightharpoonup }{b}$