越冬水体补养速度慢是（）
A.注水补养
B.循环水补养
C.打冰眼
D.抽水
参考答案：C
The companies are working together to create________ they hope will be the best
means of transport in the 21st century. [ ]
A. which
B. that
C. what
D. who
简述员工民主参与的概念。
