【简答题】已知向量 a =(x,y),向量 b ∥ a ,| b |=| a |,且 b ≠ a ,则 b 的坐标为 ______.
【单选题】On Tuesdays his wife ________ garlic shrimp.
【简答题】已知向量 a = ( 3 ,1) ,且单位向量 b 与 a 的夹角为30°,则 b 的坐标为 ______.
【简答题】"Garlic shrimp is John's favorite food. On Tuesdays his wife cooks garlic shrimp." For John, Tuesdays are ________(wonderful/ terrible).
【简答题】已知向量a的坐标为(3,4),向量b的坐标为(1,2),则a-b=(_______ , _______)