2014～2015学年度第一学期七年级英语质检2014.12

班级姓名座号 评分第一部分 基础知识运用 (65分)

Ⅰ.单项选择。(15分)

( )1. —____ is the letter from?

—It’s from Mike, my pen pal. A.Where B. How C. Who ( )2. —Tom speaks English. ____ Jane ____ English, too?

—Yes, she does. A. Do; speaks B. Does; speak C. Do; speak

( )3. I often help my mother cook ____ in the morning.

A. breakfast B. lunch C. dinner

( )4. —Could you please ____ me your name?

—Sure. My name is Kate. A. to say B. say C. to tell ( )5. —Does your uncle work ____ a farm? —No, he doesn’t. He works ____ a restaurant.

A. on; on B. on; in C. in; in ( )6. —Your brother is very cute. —Yes, ____ is. We all love ____.

A. he; him B. he; he C. him; he

( )7. —Does Helen speak English ____? —Yes. Her English is very ____.

A. good; good B. well; well C. well; good

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《遥感原理与应用》

课堂实验报告

（ 20##-20##学年 第一学期）

专业班级：

学    号：

姓    名：

 

实验成绩：

□  优秀：格式完全符合规范要求，内容完整，图表规范美观；实验原理清楚，实验步骤合理，结果正确；严格遵守实验纪律，按时上交实验报告。

□  良好：格式符合规范要求，内容完整，图表规范；实验原理较清楚，实验步骤合理，结果正确；遵守实验纪律，按时上交实验报告。

□  中等：格式基本符合规范要求，内容较完整；实验原理较清楚，实验步骤基本合理，结果正确；能遵守实验纪律，能按时上交实验报告。

□  及格：格式问题较多，内容基本完整；实验原理较清楚，实验步骤基本合理，结果基本正确；能遵守实验纪律，能按时上交实验报告。

□  不及格：格式问题突出，内容不完整；实验原理不清楚，实验步骤欠合理，结果不正确；有抄袭现象，不遵守实验纪律，未时上交实验报告。

                                    指导教师签名:

                                         2015年 11月 5日 

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电子鼻在水果无损检测中的应用分析报告

摘要电子鼻具有客观、准确、快捷、全面地评价气味并且具有不破坏样品和重复性好的特点, 电子鼻可以通过对水果挥发性成分的响应实现对果蔬品质的检测，因此可运用于对水果品质评价体系中。报告介绍了电子鼻技术软、硬件工作原理和常用的模式识别算法, 并综述了电子鼻在水果成熟度监控、货架期预测、区分不同品种以及危害分析中的应用。

关键词电子鼻水果成熟度货架期品种分析

一、研究背景

许多研究结果表明，水果在采摘、包装、保存、运输及加工等环节中的损失率高达30.45%，主要原因之一即为不同成熟度的水果相互混杂所造成的。因此，根据水果的成熟度区分与筛选并及时的对其进行加工处理，对于改善水果品质、提升水果等级有重要意义。

果实采收、贮藏、及流通过程中成熟度决定了消费者的满意程度,所以对水果成熟度进行监控就显得相当重要。传统的果品成熟度检测主要是利用硬度计、糖度计、酸度计等来检测水果内部的硬度、可溶性糖、可滴定酸等一些与成熟相关的指标，均属于有损检测，不仅检测过程中要破坏水果的组织。而且无法大规模地逐个检测，不适于现代果品生产。而使用电子鼻检测水果具有无损、快速、准确和实时性的优点，可以很好的对水果的成熟度进行监控和分级，确定水果的最佳采收期以及进行货架期判断。

不同果蔬各自都具有不同的香味,这是由它们自身所含的芳香物质所决定的。芳香物质在果蔬中含量虽然极少,但因品种、成熟度和贮藏时间的不同其含量和种类各有不同。水果的成熟度是决定水果品质的主要因素。果蔬从采收到食用需要一定的时间,并且果实成熟期间最重要的变化发生在货架期阶段。果蔬在采收和随后贮藏的成熟过程中香气值不断变化。一些呼吸跃变型果实在呼吸跃变期间呼吸强度显著加强,芳香物质含量提高,呼吸高峰过后,香气值下降,品质劣变,不再适宜贮藏。电子鼻可以通过对这些挥发性成分的响应区分来实现对果蔬品质的检测。

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结型场效应管的管脚识别:

判定栅极G:将万用表拨至R×1k档,用万用表的负极任意接一电极,另一只表笔依次去接触其余的两个极,测其电阻.若两次测得的电阻值近似相等,则负表笔所接触的为栅极,另外两电极为漏极和源极.漏极和源极互换,若两次测出的电阻都很大,则为N沟道;若两次测得的阻值都很小,则为P沟道.

判定源极S、漏极D:

在源-漏之间有一个PN结,因此根据PN结正、反向电阻存在差异,可识别S极与D极.用交换表笔法测两次电阻,其中电阻值较低（一般为几千欧至十几千欧）的一次为正向电阻,此时黑表笔的是S极,红表笔接D极.

5.常效应管与晶体三极管的比较

场效应管是电压控制元件,而晶体管是电流控制元件.在只允许从信号源取较少电流的情况下,应选用场效应管;而在信号电压较低,又允许从信号源取较多电流的条件下,应选用晶体管.

场效应管是利用多数载流子导电,所以称之为单极型器件,而晶体管是即有多数载流子,也利用少数载流子导电,被称之为双极型器件.

有些场效应管的源极和漏极可以互换使用,栅压也可正可负,灵活性比晶体管好.

场效应管能在很小电流和很低电压的条件下工作,而且它的制造工艺可以很方便地把很多场效应管集成在一块硅片上,因此场效应管在大规模集成电路中得到了广泛的应用.

3、估测场效应管的放大能力

将万用表拨到R×100档，红表笔接源极S，黑表笔接漏极D，相当于给场效应管加上1.5V的电源电压。这时表针指示出的是D-S极间电阻值。然后用手指捏栅极G，将人体的感应电压作为输入信号加到栅极上。由于管子的放大作用，UDS和ID都将发生变化，也相当于D-S极间电阻发生变化，可观察到表针有较大幅度的摆动。如果手捏栅极时表针摆动很小，说明管子的放大能力较弱；若表针不动，说明管子已经损坏。

由于人体感应的50Hz交流电压较高，而不同的场效应管用电阻档测量时的工作点可能不同，因此用手捏栅极时表针可能向右摆动，也可能向左摆动。少数的管子RDS减小，使表针向右摆动，多数管子的RDS增大，表针向左摆动。无论表针的摆动方向如何，只要能有明显地摆动，就说明管子具有放大能力。 本方法也适用于测MOS管。为了保护MOS场效应管，必须用手握住螺钉旋具绝缘柄，用金属杆去碰栅极，以防止人体感应电荷直接加到栅极上，将管子损坏。

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Argumentative Essay on Automation: Technology Change and Its Consequences

Automation is the substitution of self-operating machinery or electronics for manual or animal effort to support or control a broad spectrum of processes. Examples range from automatic teller machines, to robotic farm tractors, to securities transactions, and beyond. Henry Ford's use of the conveyor belt to produce Model T Fords in the early 1900s was a precursor to today's assembly lines that feature robotic assembly stations and automated inventory control, testing, and defect detection, all of which can be quickly reconfigured to accommodate variations of car models. Information technology is a form of automation used to process data, transmit information, or handle transactions, such as to order merchandise, buy or sell securities, or make hotel reservations.

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The Research of Chinese and Western Names in

Cross-cultural Communication

1. Background: The name culture has inevitable influence and indispensable impact on the daily interactions of the population of the East and West. Doing research on the differences and similarities of the name culture of the East and West is of great significance in cross-cultural communication to enhance the bilateral cultural exchange, communication, and mutual understanding. Name culture has been increasingly applied in real life.

Taking the aspect of the origins, development and constitution, this article does search on the history, culture ideas, religion (Christian), way of thinking, concept of the family, values and worldviews of Western and Chinese names. Describing the similarities of Western and Chinese names, listing the differences of them and analyzing the reasons, describing the impact on bilateral communication of the differences to avoid misunderstanding, I would like to promote cultural integration and to improve the level of cross-cultural communication.

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Considerations about The Road Not Taken and its Inspirations

Robert Frost's poem "the road not Taken" is credited as the most analyzed, anthologized and quoted poem in the history of American poetry. This poem was published in the year 1916 and is published in the Mountain Interval collection (Frost, 56). The poem exudes two different forms of interpretations: the literal and implied. The literal interpretation promotes individualism as well as non-conformity. The content of the poem reveals a formal as well as moralistic content. The last three lines of the poem are most famous of the poem and form the message of the poem. Frost himself referred to the poem as amongst the tricky poems he has ever written. This trickiness is attributed to the time frame of the poem as well as the different interpretations of the words "sigh" and "difference". The title itself presents an enigma that if the poem is indeed about the road not taken, does the writer finally take it or does the road refer to the one which most people take and the poet does not take? Another trick which lies in the message is the fact that it does not quite matter the road taken since even when a person looks down to the bend, the actual road to be followed cannot be quite chosen

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