Software Engineering Economy is an effective part of software engineering, which of the following content is the research comtent of software engineering economy Ⅰ．Estimation of software development cost Ⅱ．Earn & Cost analysis of software development Ⅲ．Adjustment of software development progress

A． Ⅲ only

B． Ⅱ and Ⅲ

C． Ⅰ and Ⅱ

D． all

园林建设工程按造园的要素及工程属性，可分为哪几大部分？（）

A、园林工程

B、园林建筑工程

C、种植工程

D、园林综合管网工程