与长江三角洲地区相比,东北地区发展商品谷物农业的优势条件是( )
A:水热条件优越
B:人均耕地面积大
C:消费市场广阔
D:农业科技先进
若x-22=2﹣x,则x的取值范围是____ ;若3+7的小数部分是m,3﹣7的小数部分是n,则m+n=____
—Yes, I do. And l also know that some of them are scaring.
该实验主要目的是测验( )
Shengzhou Ⅶ has been ____ (success) set up into the space.