2020 National Question 5 Single-choice Differentiating 2020_新课标II Paper 5.已知单位向量a,b的夹角为 $1 6 0 ^ { \circ }$ ,则在下列向量中,与b垂直的是( ) A. a+2bB. 2a+bC. a–2bD. 2a–b Answer keyD ☆ SaveCan't do it, show the explanation查看原卷 →