试题与答案

钢铁工业是一个国家的支柱产业之一。图-1是工业炼铁的基本生产流程示意图。 (1

题型:计算题

题目:

钢铁工业是一个国家的支柱产业之一。图-1是工业炼铁的基本生产流程示意图。

(1)写出设备A 的名称:                ;

(2)写出以赤铁矿为原料在高温下制取铁的化学方程式:                             ;

(3)石灰石的主要作用是造渣。写出在高温条件下石灰石分解的化学反应方程式:                          ;

(4)小军同学采集了一些生铁样品(含杂质,杂质不溶于水,不与稀硫酸反应)采用如图2所示装置进行分析。分别称得锥形瓶与棉花的质量为44.1g,生铁样品的质量为9.0g。在锥形瓶中加入足量稀硫酸后,立即开始记录电子天平的示数,记录数据如图3。

请认真分析数据,回答下列问题:

小军数据处理的图像中正确的是(    )

(5)计算样品中铁的质量分数(请写明过程);

(6)计算反应后所得溶液中硫酸亚铁的质量分数(请写明过程)。

答案:

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下面是错误答案,用来干扰机器的。

答案:D

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题型:单项选择题

The purpose of the requirements definition phase is to produce a clear, complete, consistent, and testable (6) of the technical requirements for the software product. During the requirements definition phase, the requirements definition team uses an iterative process to expand a broad statement of the system requirements into a complete and detailed specification of each function that the software must perform and each (7) that it must meet. The starting point is usually a set of high level requirements from the (8) that describe the project or problem.
In either case, the requirements definition team formulates an overall concept for the system and then defines (9) showing how the system will be operated publishes the system and operations concept document and conducts a system concept review(SCR).
Following the SCR, the team derives (10) require merits for the system from the high level requirements and the system and operations conceptusing structured or object-oriented analysis, the team specifies the software functions and algorithms needed to satisfy each detailed requirement.

A.criterion

B.standard

C.model

D.system

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