()是利用高温热风加热焊锡膏和电路板及元器件的引脚,使焊锡膏熔化来实现焊装或拆卸的目

题型:单项选择题

问题:

()是利用高温热风加热焊锡膏和电路板及元器件的引脚,使焊锡膏熔化来实现焊装或拆卸的目的。

A.吸锡电烙铁

B.电热风枪

C.热熔胶枪

D.吸锡器

考点:电子设备装接工电子设备装接工(高级)电子设备装接工(高级)题库
题型:单项选择题

阅读下文,回答问题。

  ①孙叔敖者,楚之处士也。虞丘相进之于楚庄王以自代也。三月为楚相,施教导民,上下和合,世俗盛美,政缓禁止,吏无 * * 邪,盗贼不起。秋冬则劝民山采,春夏以水,各得其所便,民皆乐其生。

  ②庄王以为币轻,更小以为大,百姓不便,皆去其业。市令言之相曰:“市乱,民莫安其处,次行不定。”相曰:“如此几何顷乎?”市令曰:“三月顷。”相曰:“罢,吾今令之复矣。”后五日,朝,相言之王曰:“前日更币,以为轻。今市令来言曰'市乱,民莫安其处,次行之不定'。臣请遂令复如故。”王许之,下令三日而市复如故。

  ③楚民俗好庳车,王以为庳车不便马,欲下令使高之。相曰:“令数下,民不知所从,不可。王必欲高车,臣请教闾里使高其捆。乘车者皆君子,君子不能数下车。”王许之,居半岁,民悉自高其车。

  ④此不教而民从其化,近者视而效之,远者四面望而法之。故三得相而不喜,知其材自得之也;三去相而不悔,知非己之罪也。(选自《史记·循吏列传》)

  【注】①次行:秩序。②庳:低、矮。③捆:门槛。

1.写出下列加粗词语在句中的意思。

(1)秋冬则民山采____________

(2)各得其所便,民皆其生____________

(3)市令曰:“三月。”____________

(4)令数下,民不知所____________

2.下列句中加粗词语不存在古今异义现象的一项是(     )

A.政缓禁止

B.庄王以为币轻

C.如此几何顷乎

D.臣请教闾里使高其捆

3.用现代汉语解释下列句子。

(1)虞丘相进之于楚庄王以自代也。

 ______________________________________________

(2)王许之,居半岁,民悉自高其车。

 ______________________________________________

4.第④段写出了孙叔敖_________的性格特征。

5.联系文本,简析孙叔敖施政的具体策略。

 ______________________________________________

题型:单项选择题
13×8=3900÷3=100-57=2+72×2=50÷7=
280÷7=5×1200=54+19=80-40÷2=405×5=
题型:单项选择题

(10分)过氧化氢俗名双氧水,医疗上利用它有杀菌消毒作用来清洗伤口。根据下列

反应回答问题:

A.Na2O2+2HCl=2NaCl+H2O2  

B.Ag2O+H2O2=2Ag+O2↑+H2O

C.2H2O2=2H2O+O2

D.3H2O2+Cr2(SO43+10KOH=2K2CrO4+3K2SO4+8H2O

(1)上述反应中,H2O2仅体现氧化性的反应是(填代号,下同)          ,H2O2既体现氧化性又体现还原性的反应是           ,H2O2体现酸性的反应是           

(2)上述反应说明H2O2、Ag2O、K2CrO4的氧化性由强到弱的顺序是                 

(3)保存过氧化氢试剂瓶上的最适合贴上的一个标签是            (填序号);

(4)某强酸反应体系中发生的一个氧化还原的离子反应,反应物和生成物共六种微粒:

O2、MnO4-、H2O、Mn2+、H2O2、H+。已知该反应中H2O2只发生了如下过程:H2O2→O2

①反应体系选择的酸是:        (填序号)。

A.盐酸   B.浓硫酸  C.稀硫酸   D.醋酸

②如果上述反应中有6.72L(标准状况)气体生成,转移的电子为     mol。

(5)H2O2有时可作为矿业废液消毒剂,有“绿色氧化剂”的美称;如消除采矿业胶液中的

氰化物(如KCN),经以下反应:KCN+H2O2+H2O=A+NH3↑,试指出生成物A的化学式为          ,并阐明H2O2被称为绿色氧化剂的理由是              

题型:单项选择题

阅读理解。

     The physical memory dump error is a big problem that affects even the most advanced computer

systems.Although it's quite a rare error, it's one of the most stopping what you're doing and restarting

your computer-making you lose all your unsaved data.This is a big problem, but there is actually a very

easy way to fix it.

     There are two reasons why the physical memory dump happens.The first is pretty simple and is to do

with the "hardware", and if any of thesepieces are not fit for your system, it will cause the physical

memory dump.So, if you've recently added any hardware to your PC, then take that out and see if it

works.

     The other reason is your system, the "registry".The registry is a big database that operates in the

background of Windows, storing all sorts of settings and information about your PC.The problem with

the registry is that since it has so many important files inside, it's constantly got hundreds of files open

every time you use your PC.And because there are so many files to open at once, Windows is constantly

getting confused, leading it to save many of these files in the wrong way.These files go wrong when saved wrongly, making them difficult for your computer to read.However, if it can't read the files at all, it has no

choice but to stop everything it's doing and restart your PC.This is why the physical memory dump error

appears so easily-because when a registry file is so wrong that it can't be read, your computer needs to

refresh itself immediately.

     This latter reason for causing the physical memory dump is actually extremely common and the

likelihood is that your PC is suffering from it, if you're seeing this error.Luckily, it's also incredibly easy to

fix-you just need to use a software tool called a "registry cleaner" to go through the registry and fix all the

problems in there.

1. From the text we can infer that ________.

A. the dump error often happens to your PC

B. the dump can be dealt with easily

C. only the advanced computers suffers from the error

D. the dump error can cause the data in your PC to be lost

2. The reason that your PC has the dump error is that ___________.

A. the hardware loses its memory

B. your Windows needs to be upgraded

C. you have saved wrong files in the PC

D. you have stored too many files in the PC.

3.What's problem with the registry when your PC goes wrong?

A. The register can't read the files correctly.

B. It must open 100 files every time you use your PC.

C. The register doesn't agree with the database.

D. The register must save many important files inside.

4.What does a registry cleaner means?

A. A software which can help you save time.

B. A software which can remove unnecessary files

C. A software which can repair the machine.

D. A software which makes your PC down.

题型:单项选择题

雷击产生的高电压可对电气装置和建筑物及其他设施造成毁坏,电力设施或电力线路遭破坏可能导致大规模停电。

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