It's often ____ (wind) in spring in my hometown.
若ax=4,ay=7,则a2y+x的值为( )
图表示某种环流示意图,读图完成下题.
玲玲应建议妈妈去____家商场购物呢?
在实数范围内因式分解:x2y﹣3y=____ .