两条直线相交成直角时,这两条直线互相______,它们的交点叫做______. 发布时间:2017-06-20 21:09 │ 来源:www.tikuol.com 题型:填空题 问题: 两条直线相交成直角时,这两条直线互相______,它们的交点叫做______.
题型:填空题 Around the world there are many young people________a great deal of money on listening to pop or rock music.A.spendingB.spendC.to spendD.spent 查看答案