题目内容

关于预加氢循环氢采样,下列做法错误的是()。

A. 用样品置换采样袋两、三遍
B. 采样前可用鼻嗅检查硫化氢浓度
C. 采完样后采样袋口扎好
D. 采样袋即使置换了,也不能混用

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A developer has created a web application that includes a servlet for each use case in the application.These servlets have become rather difficult to maintain because the request processing methods havebecome very large. There is also common processing code in many servlets because these use cases arevery similar. Which two design patterns can be used together to refactor and simplify this web application?()

A. Proxy
B. View Helper
C. Front Controller
D. Session Facade
E. Business Delegate
F. Model-View-Controller

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