教育作为促进人类发展的社会实践活动，是一个相对独立的社会系统，其基本要素主要包括： 、 、 和教育手段。
查看答案
吊顶天棚以楼板、屋架或屋面板为支撑点，用吊杆连接大、小龙骨再镶贴各种饰面板的天棚装饰工程。
A. 对
B. 错
初等函数在其定义域内一定可导.
A. 对
B. 错
These winds blow much more strongly, so they can produce______ energy.
A. be used as
B. a huge amount of
C. from all over the world
D. a key to
When you first meet, he seems______ quite like his father, but the more you get to know him, the more you realize he is most like his mother.
A. in some way
B. open the door to
C. be used as
D. in one's own country
微信支付 
支付宝支付