根据图回答问题．

（1）写出有标号仪器的名称①______．

（2）用A装置制取气体的主要操作步骤有①加入药品、②检验装置的气密性、③加热、④收集气体、⑤停止加热、⑥从从水槽中移出导管；正确的顺序是______（写序号）．该装置用加热高锰酸钾（KMnO₄）分解生成锰酸钾（K₂MnO₄）、二氧化锰和氧气，写出反应的化学方程式______．

（3）B、C分别盛满氧气，若进行铁丝在氧气中燃烧的实验，应选用的一瓶是______（填字母）．

（4）D装置用来测定空气中氧气的含量，红磷燃烧的化学方程式为______．若实验准确无误，打开止水夹后观察到______．

Ravi,like many project__(1)__,had studied the waterfall model of software development as the primary software life-cycle__(2)__.He was all set to use it for an upcoming project,his first assignment.However,Ravi found that the waterfall model could not be used because the customer wanted the software delivered in stages,something that implied that the system had to be delivered and built in__(3)__and not as__(4)__. 　

The situation in many other projects is not very different.The real world rarely presents a problem in which a standard process,or the process used in a previous project,is the best choice.To be the most suitable,an existing process must be__(5)__to the new problem.

A development process,even after tailoring,generally cannot handle change requests.To accommodate change requests without losing control of the project,you must supplement the development process with a requirement change management process.

空白（3）处应选择（）

A.parts

B.modules

C.software

D.awhole