A:降水丰富,水源充足
B:水土流失严重
C:位于二、三阶梯的分界处
D:河流以冰雪融水补给为主
多项式6x3y2-3x2y2-18x2y3分解因式时,应提取的公因式是( )
One of the most famous places of interest in China _________ the Palace Museum.
I have only two tickets for TF Boys' concert. ______ you _____ he can go on with me.