青霉素钠在强酸中加热生成
A．6-氨基青霉烷酸B．青霉素钠C．β-内酰胺环开环产物D．青霉二酸钠E．青霉胺和青霉醛
参考答案：E
Software Engineering Economy is an effective part of software engineering, which of the fol-lowing content is the research content 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
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