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科目:高中數學 來源: 題型:
A.a,b,c中有且僅有兩個向量共線
B.a,b,c中有且僅有兩個向量相等
C.a,b,c可通過適當平移構成一個正三角形
D.a=b=c
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科目:高中數學 來源: 題型:
A.30° B.60° C.120° D.150°
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