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問答題

判斷下列命題正確的是（）平行四邊形兩對邊所在的向量一定是相等向量

答案：（4）（1）錯(cuò)。因?yàn)閮蓚€(gè)向量的方向相同或相反叫共線向量，而兩個(gè)向量所在直線平行時(shí)也稱它們?yōu)楣簿€向量，即共線向量不一定在...

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多項(xiàng)選擇題

--- Shall we take a car --- No, we _____. It ’ s only five minutes ’ walk.

A.can ’ t
B.needn ’ t
C.mustn ’ t
D.couldn ’ t