A: You've got the tube tickets from a machine, I suppose? B: No, I got iy by standing in a queue. A: You_______(stand) in a queue. You could have got them from a machine.
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举一反三
【简答题】已知向量 a =(3,m,2), b =(6,2,m-1),若 a ⊥ b ,则实数m的值为______.