若向量a,b满足|a|=|b|=1,且夹角为60°,则a•a-a•b=( ) A. 发布时间:2017-04-14 15:14 │ 来源:www.tikuol.com 题型:选择题 问题: 若向量a,b满足|a|=|b|=1,且夹角为60°,则a•a-a•b=( )A.-32B.-32C.-12D.12
题型:选择题 按照示例,仿写一个句子。例句:如果爱是左右手,事只递给老人,另一只递给孩子。仿写:如果爱是左右手,________________________,________________________。 查看答案
题型:选择题 ________cleaning the yard and making up the beds for the old,we also read newspapers for them and had chats with them.[ ]A.Except for B.Rather thanC.Apart from D.Instead of 查看答案