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问题 问答题 简答题

简述纳氏试剂分光光度法测定氨氮的反应原理。

答案

参考答案：

①水中的游离氨或氨的盐，与纳氏试剂作用，根据不同的氨浓度形成1炎黄、深黄到棕色的氨

基乘络合物的碘衍生物

②比色定量试剂是由HgI2、KI和NaOH（或KOH）等试剂配制成

单项选择题 共用题干题

A requirement is simply a statement of what the system must do or what characteristics it needs to have. Requirements written from the perspective of user and focus on user needs are called (1). Requirements written from the developer's perspective and describe how the system will be implemented are called (2). Requirements evolve from detailed statements of the business capabilities that a system should have to detailed statements of the technical way in wluch the capabilities will be implemented in the new system. Requirements can be either functional or nonfunctional in nature. For example, during the analysis phase of travel vehicles sales system, the system that must have the ability to search for available inventory is (3). The requirement that the system should be able to work on any Web browser belongs to (4). That customer personal information is protected in compliance with the Data Protection Act is a requirement of (5).

空白（3）处应选择（）

A.a functional requirement

B.a technical requirement

C.a noperational requirement

D.a service requirement
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单项选择题

管道压浆工艺可分为（）。

A、一次压浆、二次分端压浆和真空辅助压浆

B、一次压浆、二次分端压浆和三次压浆

C、一次压浆和真空辅助压浆
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