A:更多使用铁制农具
B:实行商鞅变法
C:重视水利工程建设
D:牛耕得到推广
x+8,3+10=13,7x+5>3都是方程.
The number of people at the concert was_____ than expected. There were many tickets left.
中东的石油大部分从波斯湾海运输出来。下图中A 路线经过的地方是( )