【单选题】在下列 说法 中, 正确的 是 ( ) A .两个有公共起点且共线的向量,其终点必相同 ; B .模为 0 的向量与任一非零向量平行 ; C .向量就是有向线段 ; D . 若 | a |=| b | ,则 a = b
【单选题】听力原文:M:Oh,I am so angry.My wife hasn't been speaking any word with me.I am so busy with my work that I forgot her birthday. W:I will be the same if I were your wife.If you can not keep it in mind,you ...
A.
His wife should excuse him.
B.
His wife has no reason to do that.
C.
He should have remembered it.
D.
He is right to be angry.
【单选题】患者宁某,糖尿病住院治疗,医嘱皮下注射普通胰岛素8U,ac 30分,ac的执行时间是