设 $\stackrel{\rightharpoonup }{a},\stackrel{\rightharpoonup }{b},\stackrel{\rightharpoonup }{c}$为同一平面内具有相同起点的任意三个非零向量，且满足 $\stackrel{\rightharpoonup }{a}$与 $\stackrel{\rightharpoonup }{b}$不共线， $\stackrel{\rightharpoonup }{a}\perp \stackrel{\rightharpoonup }{c},\left|\stackrel{\rightharpoonup }{a}\right|=\left|\stackrel{\rightharpoonup }{c}\right|$,则 $\left|\stackrel{\rightharpoonup }{b}·\stackrel{\rightharpoonup }{c}\right|$的值一定等于(     )

A．	以   $\stackrel{\rightharpoonup }{a},\stackrel{\rightharpoonup }{b}$为邻边的平行四边形的面积	B．	以   $\stackrel{\rightharpoonup }{b},\stackrel{\rightharpoonup }{c}$为两边的三角形面积
C．	以   $\stackrel{\rightharpoonup }{a},\stackrel{\rightharpoonup }{b}$为两边的三角形面积	D．	以   $\stackrel{\rightharpoonup }{b},\stackrel{\rightharpoonup }{c}$为邻边的平行四边形的面积