【简答题】若向量 a =(4,1), b =(2,x-1), a ∥ b ,则x=______.
【单选题】若向量 a 与 4 b - 2a 垂直,其中向量 a =(-1,1), b =(x,2) ,则实数x的值是( )
【单选题】已知向量 a = (1,2) , b = ( x, 4) ,若向量 a ∥ b ,则 x = ( )
【简答题】Jack says if we want to change the world, we have to _____________.
【判断题】If we want to adjust to a new culture, we need to change our values.
【简答题】已知向量 a =(1 , 2) , b =(x , 4) ,若向量 a ⊥ b ,则x=______.
【判断题】If we want to adjust to a new culture, we need to change our values.
【判断题】电涡流式传感器属于电容式传感器,可以用于无损探伤( )