按水利工程计价规范，项目编码第十至十二位为（）顺序码。

A.分类工程

B.分项工程

C.清单项目名称

D.水利、水电工程

The following are basic principles of the Oral Approach EXCEPT______.

A. selection principle


B. gradation selection principle
C. four skills principle


D. presentation principle