问题 问答题 简答题

休闲农机具应如何保养?

答案

参考答案:

由于农业机械使用上的季节性和本身工作的局限性,一种农机具一年内只能完成一种或几种作业项目,而且只工作很少一段时间,停放保管的时间很长。一般农机具又不象工业机械那样库房内保管,而经常在露天放置,遭受风吹、日晒、雨淋等侵蚀,如不精心保管,机具在停放期间的损坏,将远远超过工作期间的损坏,甚至变成一堆废铁。为了延长机具使用寿命,休闲期应做到以下’五防’。

1.防锈蚀

(1)农业机械在田间作业完毕后,必须清除外部泥垢,清理工作机构内的种子、化肥、农药和作物残株,必要时用水或油清洗。

(2)清洗各润滑部位,并重新进行润滑,对所有摩擦工作面,如犁铧、犁壁、开沟器、锄铲等必须擦净后涂机油,最好贴纸,以减少与空气接触的机会。

(3)复杂精密的机具最好放在阴凉、干燥、通风的室内保管;对犁、耙、 * * 器等简单机具,可以露天保管,但要放在地势较高,干燥,不受阳光直射的地方,最好能搭棚遮盖;凡与地面直接接触的零件,应用木板或砖支起;脱落的防护漆要重新涂好。

2.防腐朽、霉烂

(1)木制的零件由于受微生物的作用,以及雨淋、风吹、日晒而腐朽、破裂和变形,有效的保管方法是在木料外表涂上油漆,置于干燥的地方,不要受到日晒、雨淋。

(2)纺织品类,如帆布输送带,存放不当易霉烂。这类制品不应在露天放置,应该拆下清洗晒干后,存放在室内干燥和能防虫、防鼠害的地方。

3.防老化橡胶或塑料制品由于受空气中的氧和阳光中的紫外线作用,易老化变质,使橡胶件的弹性变差和容易折断。对橡胶件的保管,最好用热的石蜡油涂在橡胶表面,一定要放在室内的架子上,用纸将其盖好,保持通风、干燥及不受阳光直射。

4.防变形弹簧、传动带、长刀杆、轮胎等零件由于长期受力或放置不当会产生塑性变形,为此应在机架下面加以适当的支撑;使轮胎不承受负载;机械上的所有压紧或拉开的弹簧必须放松;拆下传动带在室内妥善保管;有些拆下的易变形零件如长刀杆要放平或垂直挂起;另外拆下的零件如轮胎、输种管等保管时要防止积、挤、压变形。

5.防丢失对长期停放的机具应建立登记卡,详细记载机具的技术状态、附属装置、备件、工具等;各种机具应有专人保管;严禁拆卸零件作其他用;如没有库房,机具在室外停放时,应将电动机、传动带等易丢件拆下来并作好标记,存放在室内。

阅读理解

阅读理解。

     Some years ago, a Miami woman walking through an office building noticed two men standing together.

Several minutes after her leaving, the men murdered a person working in the building. The police determined

that the woman was the only witness and could possibly describe them. However, her memory of the men

proved disappointingly unclear. Several days later, psychologist Ronald Fisher was brought in to obtain a

more complete account from the woman. His interview produced a breakthrough-the woman reported a clear

picture of one of the suspects. The important information enabled the police to arrest the suspect and close

the case.

     The police asked Fisher for help because of his rich knowledge in cognitive (认知的) interview, a kind of

memory-rebuilding process. Memory researchers have found that people trying to remember a past event often

only recall part of the relevant information. Human memory is selective and it is often distorted by stress. But

a person's accurate recall of an event or understanding of a question can be improved using specific

interviewing techniques. The "cognitive interview" was developed in the late 1990s. It encourages the witness

to take an active role in recalling information rather than giving answers only to someone else's questions.

     The witness first describes what happened in his or her own words, with no interviewer interruptions. The

interviewer then goes further with specific techniques, such as having the witness tell the detail', of what

happened from different perspectives (角度).

     The cognitive interview focuses on guiding witnesses through four general recalling techniques: thinking

about physical surroundings and personal feelings that existed at the time of past events; reporting everything

that comes to mind about those events, no matter how broken it is; retelling events in a variety of time orders,

such as from beginning to end, end to beginning, forward or backward; and adopting different perspectives

while recalling events.

     Experiments with police detectives trained in this demanding interview method find that they obtain nearly

50% more information from witnesses than before training, while error rates remain about the same. It is

proved that cognitive interviews are quite important tools in improving the accuracy and completeness of

witness testimony (证词).

1. The purpose of the passage is to _____.

A. give an account of a murder case

B. help a witness to recall information in a cognitive interview

C. prove Fisher was an expert in cognitive interview

D. introduce an idea of cognitive interview

2. What is required to recall in a cognitive interview for a witness?

A. The surroundings and feelings at the time of the event.

B. The information about the event in the time order.

C. The important things that come to his or her mind.

D. The exact time at which a murder took place.

3. The key point in a cognitive interview is that _____.

A. the interview should take place outside the police station

B. the interviewer should interrupt the witness from time to time

C. the witness is encouraged to take part in recalling information

D. the witness should recall details at the scene of the event

4. The underlined word "distorted" in the passage probably means "_____."

A. changed

B. balanced

C. arranged

D. examined

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