常见的复合液压缸有（）。

A. The inner query always sorts the results of the outer query.
B. The outer query always sorts the results of the inner query.
C. The outer query must return a value to the inner query.
D. The inner query returns a value to the outer query.
E. The inner query must always return a value or the outer query will give an error.

A. 利用信息
B. 监测信息的交流及其反馈
C. 资料的整理和分析
D. 信息资料的收集