— Talking loudly in a library is impolite.
— In fact, we should also ________ not to cough(咳嗽) or sneeze(打喷嚏)loudly in public.
①坚持了面向世界,博采众长
②继承传统,推陈出新
③犯了“民族虚无主义”和“历史虚无主义”的错误
④立足于文化多样性
求满足下列条件的直线方程:
(1)求经过直线l1:x+3y﹣3=0,l2:x﹣y+1=0的交点,且平行于直线2x+y﹣3=0的直线l方程;
(2)求在两坐标轴上截距相等,且与点A(3,1)的距离为2的直线l的方程.