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【单选题】
已知两个非零向量 a 与 b ，定义| a × b |=| a || b |sinθ，其中θ为 a 与 b 的夹角．若 a =（-3，4）， b =（0，2），则| a × b |的值为（ ）A.
-8
B.
-6
C.
6
D.
8
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