方程3x﹣y=4中,有一组解x与y互为相反数,则3x+y=____ .
These fans arrived very early. They could see their favorite stars. (合并成一个句子)
These fans arrived very early ____ they could see their favorite stars.
有一列数,2、5、8、11、14、…则104在这列数中是第( )个数.
① 篡权建立的封建王朝 ②短期统一 ③统治阶级内部矛盾、阶级矛盾、民族矛盾交织在一起 ④被农民起义推翻