若直线ax+by=1的法向量为(1,2),则直线bx-3ay+5=0的倾斜角为_ 发布时间:2017-04-16 22:22 │ 来源:www.tikuol.com 题型:填空题 问题: 若直线ax+by=1的法向量为(1,2),则直线bx-3ay+5=0的倾斜角为______.
题型:填空题 We can easily become unhappy ________ we work out our problems in our daily life. [ ]A. after B. if C. until D. unless 查看答案