Gaokao Math Practice Question
8.已知非零向量 $\boldsymbol{a}, \boldsymbol{b}$ 满足 $|a|=2|b|$, 且 $(\boldsymbol{a}-\boldsymbol{b}) \perp \boldsymbol{b}$, 则 $\boldsymbol{a}$ 与 $\boldsymbol{b}$ 的夹角为
- A.$\frac{\pi}{6}$
- B.$\frac{\pi}{3}$
- C.$\frac{2 \pi}{3}$
- D.$\frac{5 \pi}{6}$
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