相关试题
【判断题】
细齿锯条适用锯削软材料和截面较大的零件。粗齿锯条适用于锯削硬材料和薄壁零件
【判断题】
安装锯条时，锯齿方向必须朝后，锯条绷紧程度要适当
【判断题】
锯削时推力和压力由右手控制，左手压力不要过大，主要应配合右手扶正锯弓，锯弓向前推出时加压力，回程时不加压力，在零件上轻轻滑过
【判断题】
锯削时最好使锯条全部长度参加切削，一般锯弓的往返长度不应小于锯条长度的 2/3
【判断题】
锯条开始切入零件称为起锯。起锯方式有近起锯和远起锯
【判断题】
起锯时要用左手拇指指甲挡住锯条，起锯角约为 15°。锯弓往复行程要短，压力要轻，锯条要与零件表面垂直
【判断题】
钳工操作时工具、夹具、量具应放在指定地点，严禁乱堆乱放；应顾及前后左右，并保持一定的距离，以免碰伤他人
【判断题】
砂轮机是用来刃磨钻头、錾子等刀具或其他工具的常用设备
【判断题】
砂轮起动后，应等砂轮旋转平稳后再开始磨削，若发现砂轮跳动明显，应及时停机修整
【判断题】
粗锉刀适用于加工余量小、精度要求高和表面粗糙度值较小的工件
【判断题】
交叉锉法一般适用于作粗锉，精锉时必须采用顺向锉，使锉痕变直纹理一致
【判断题】
锉刀是锉削的主要工具，锉刀主要用合金钢制成
【判断题】
锉刀按齿纹分为单齿纹和双齿纹。单齿纹锉刀的齿纹只有一个方向，与锉刀中心线成70°，一般用于锉硬金属，如铜、锡、铅等
【判断题】
锉刀按断面形状可分成：板锉(平锉)；方锉；三角锉；圆锉；半圆锉等
【判断题】
普通锉刀的规格一般是用锉刀的长度，齿纹类别和锉刀断面形状表示的
【判断题】
锉削过程中，两手用力也时刻在变化。开始时，左手压力大推力小，右手压力小推力大。随着推锉过程，左手压力逐渐减小，右手压力逐渐增大
【判断题】
锉刀往复运动速度一般为80 次/min～90 次/min，推出时慢，回程时可快些
【判断题】
锉削平面的方法有 3 种：顺向锉法、交叉锉法、推锉法
【判断题】
锉削平面时，锉刀要按一定方向进行锉削，并在锉削回程时稍作平移，这样逐步将整个面锉平
【判断题】
检验工具有刀口形直尺、90°角尺、游标角度尺等。刀口形直尺、90°角尺可检验零件的直线度、平面度及垂直度
【判断题】
检验时，如果刀口形直尺与零件平面透光强弱不一，则该零件平面度合格；如果透光微弱而均匀，则说明该零件平面凹凸不平
【判断题】
可在刀口形直尺与零件紧靠处用塞尺插入，根据塞尺的厚度即可确定平面度的误差
【判断题】
钳工加工孔的方法一般指钻孔、扩孔和铰孔
【判断题】
一般情况下，孔加工刀具都应同时完成两个运动：主运动，即刀具绕轴线的旋转运动；进给运动，即刀具沿着轴线方向对着零件的直线运动
【判断题】
麻花钻是钻孔的主要刀具。麻花钻用低速钢制成，工作部分经热处理淬硬。麻花钻由钻柄、头部和工作部分组成
【判断题】
钻头颈部是磨削工作部分和钻柄时的退刀槽。钻头直径、材料、商标一般刻印在颈部
【判断题】
钻头导向部分经铣、磨或轧制形成两条对称的螺旋槽，用以排除切屑和输送切屑
【判断题】
钻孔钻削用量包括钻头的钻削速度或转速和进给量。钻削用量受到钻床功率、钻头强度、钻头耐用度和零件精度等许多因素的限制
【判断题】
钻孔前先用样冲在孔中心线上打出样冲眼，用钻尖对准样冲眼锪一个小坑，检查小坑与所划孔的圆周线是否同心(称试钻)
【判断题】
用扩孔钻或钻头扩大零件上原有的孔叫扩孔。孔径经钻孔、扩孔后，用铰刀对孔进行提高尺寸精度和表面质量的加工叫铰孔
【判断题】
丝锥是加工小直径内螺纹的成形工具，它由切削部分，校准部分和柄部组成
【判断题】
丝锥切削部分和校准部分一般沿轴向开有 1～2条容屑槽以容纳切屑，并形成切削刃和前角γ 切削部分的锥面上铲磨出后角α
【判断题】
常用高碳优质工具钢或高速钢制造，手用丝锥一般用 T12A或 9SiCr制造
【判断题】
双手转动铰手，并横向加压力，当丝锥切入零件 1～2 牙时，用直尺检查丝锥是否歪斜，如丝锥歪斜，要纠正后再往下攻
【判断题】
当丝锥位置与螺纹底孔端面垂直后，轴向就不再加压力。两手均匀用力，为避免切屑堵塞，要经常倒转 1/2 圈～1/4 圈，以达到断屑的目的
【判断题】
板牙是加工外螺纹的工具。圆板牙就像一个圆螺母，不过上面钻有几个屑孔并形成切削刃
推荐试题
【填空题】
commence,deserve,tempting, coordinate,
lodge,confess, grant, proceed ,display, consequently
9 As the finance ministry rejected the defor its "lack of clarity",it[ ]complaint with the Europear Commission that this deal was against the law
【填空题】
commence,deserve,tempting, coordinate,
lodge,confess, grant, proceed ,display, consequently
5 State governments and the colleges themselves have [ ] financial help to students with special abilities and those with financial needs
【填空题】
commence,deserve,tempting, coordinate,
lodge,confess, grant, proceed ,display, consequently
10 Dogs cannot distinguish the color of trafficlights, so the master must make the decision of when it is safe to [ ] across the road
【填空题】
commence,deserve,tempting, coordinate,
lodge,confess, grant, proceed ,display, consequently
6 The committee agreed that his papers
[ ] a wider circulation because of their essential and fundamental interest to a larger audience.
【填空题】
prepare for , be bound to , stand up for , in favor of ,speculate about , in the company of, in the form of , be liable to , invest..with , in succession
1 Because women often restrict their diet
In an effort to control weight,they may
Not consume enough iron-rich food and
( ) experience an iron Deficiency.
【填空题】
commence,deserve,tempting, coordinate,
lodge,confess, grant, proceed ,display, consequently
8 Americans defend the right to obtain a gun and they have[ ] been willing to turn a blind eye to the harm that people owning guns have caused
【填空题】
commence,deserve,tempting, coordinate,
lodge,confess, grant, proceed ,display, consequently
7 The anger and frustration [ ] by the local people who do not understand what is happening to them will be a terrible and dangerous force
【填空题】
prepare for , be bound to , stand up for , in favor of ,speculate about , in the company of, in the form of , be liable to , invest..with , in succession
2 Some reform advocates ignore the impact of
Class size on student achievement,and they
are ( ) what they call as a Priority:teacher effectiveness.
【填空题】
prepare for , be bound to , stand up for , in favor of ,speculate about , in the company of, in the form of , be liable to , invest..with , in succession
3 Because of easy access to the Internet,the
New breakthrough tq create something
Truly creative ( ) happen anytime now.
【填空题】
prepare for , be bound to , stand up for , in favor of ,speculate about , in the company of, in the form of , be liable to , invest..with , in succession
4 Indeed,if teachers want to( ) how far students might get in life, a better measurement than grades might be how hard the students try.
【填空题】
prepare for , be bound to , stand up for , in favor of ,speculate about , in the company of, in the form of , be liable to , invest..with , in succession
5 Nature has( ) these animals ( ) a capacity for not showing Fear.
【填空题】
prepare for , be bound to , stand up for , in favor of ,speculate about , in the company of, in the form of , be liable to , invest..with , in succession
6 During the weeks of discussion,delegations
from groups who are interested in the
Resolution may call on representatives to
( ) their point of view.
【填空题】
prepare for , be bound to , stand up for , in favor of ,speculate about , in the company of, in the form of , be liable to , invest..with , in succession
7 Plato was a superb writer,and his works are
Part of the world’s great literature.Most of
His existing work is ( )Dialogs and letters.
【填空题】
prepare for , be bound to , stand up for , in favor of ,speculate about , in the company of, in the form of , be liable to , invest..with , in succession
8 Young people should enter into a broad
Flexible training program,through which
They can learn a lot and be ( ) their future careers.
【填空题】
prepare for , be bound to , stand up for , in favor of ,speculate about , in the company of, in the form of , be liable to , invest..with , in succession
9 The young man is very happy and proud to
be ( ) the old professor because he always feeIs great when talking With him.
【填空题】
prepare for , be bound to , stand up for , in favor of ,speculate about , in the company of, in the form of , be liable to , invest..with , in succession
10 One day they passed more than 20 villages ( ),and some of these are Said to have stretched for six miles or more.
【填空题】
boost prospect calculate accelerate promote
mystery destruction analysis insight barrier
7 Being asingle parent,there is no way for her
to ( ) the time and energy she has
devoted to her children for the past 10 years.
【填空题】
boost prospect calculate accelerate promote
mystery destruction analysis insight barrier
8 It is essential that you start by listening because one of the main ( ) teenagers and their parents face in forming positive relationships is that neither listens to the other.
【填空题】
boost prospect calculate accelerate promote
mystery destruction analysis insight barrier
9 We all know the dangers of an earthquake: the ( ) to buildings,the troubles can be caused by falling trees,and the terror occurs when the earth actually opens uip.
【填空题】
boost prospect calculate accelerate promote
mystery destruction analysis insight barrier
10 Not until recently have we realized that the increasing world population may lead to a potential gloomy ( ) for humanity starvation.
【填空题】
boost prospect calculate accelerate promote
mystery destruction analysis insight barrier
2 It is the development strategy/of the company to ( ) its overseas expansion in order to take a slice of the world market
【填空题】
boost prospect calculate accelerate promote
mystery destruction analysis insight barrier
3 Nearly six million people go to see the Mona
Lisa every year,attracted by the ( )of her smile.When you're not lodking at her, she seems to be smiling;when you look at her,she stops.
【填空题】
Boost prospect calculate accelerate promote
mystery destruction analysis insight barrier
4 To live with a family whose native language is English is the ideal way to further improve one's English and to gain ( )into its culture.
【填空题】
Boost prospect calculate accelerate promote
mystery destruction analysis insight barrier
5 There is a real need to ( ) academic
achievement in schools and help with the
development of a student's overall character.
【填空题】
boost prospect calculate accelerate promote
mystery destruction analysis insight barrier
6 Einstein said his scientific discoveries grew
from his imagination rather than from( ),
reason and language.
【填空题】
commence,deserve,tempting, coordinate,
lodge,confess, grant, proceed ,display, consequently
1 When the police caught up with him, Mr.Foster had to [ ] that he'd broken the speed limit.
【填空题】
commence,deserve,tempting, coordinate,
lodge,confess, grant, proceed ,display, consequently
2 Whenever my boss makes a decision that I don't agree with, I tell him what I really think, though it's [ ] to make him happy by telling him his ideas are always right
【填空题】
commence,deserve,tempting, coordinate,
lodge,confess, grant, proceed ,display, consequently
3 As can be probably perceived, a manned tip to Mars may soon[ ] since scientists have achieved the manned moon mlssion
【填空题】
commence,deserve,tempting, coordinate,
lodge,confess, grant, proceed ,display, consequently
4 A number of countries are [ ]their efforts to send out food to the area worst affected by the flood.
【填空题】
immune to , fall in love with , go along with, on one's behalf, be filled with , take the liberty of , expel from , be pessimistic about
She authorizcd her partner to carry out daily responsibllitles [ ]when she was on her business trip
【填空题】
immune to , fall in love with , go along with, on one's behalf, be filled with , take the liberty of , expel from , be pessimistic about
On hering the latest news about your mother's ill health, I [ ]canceling your reservation at the Sheraton.
【填空题】
immune to , fall in love with , go along with, on one's behalf, be filled with , take the liberty of , expel from , be pessimistic about
There was an obvious indication that the police who have to enforce the new law were not[ ] the general discontent.
【填空题】
immune to , fall in love with , go along with, on one's behalf, be filled with , take the liberty of , expel from , be pessimistic about
When she heard of her failure in the experiment, her eyes[ ]tears; whether it was of shame, frustration, orgrief was difficult to tell.
【填空题】
immune to , fall in love with , go along with, on one's behalf, be filled with , take the liberty of , expel from , be pessimistic about
Rose knows that continuous letters fromJohn, together with countless roses are aimedat making her[ ]him.
【填空题】
immune to , fall in love with , go along with, on one's behalf, be filled with , take the liberty of , expel from , be pessimistic about
[ ]public school for drinking and smoking and then failing inshow business as a singer, she joined her father's business 10 years ago.
【填空题】
immune to , fall in love with , go along with, on one's behalf, be filled with , take the liberty of , expel from , be pessimistic about
Since the great scandals in banking,many people in the Country have[ ]the prospects of economic recovery within a few years.
【填空题】
immune to , fall in love with , go along with, on one's behalf, be filled with , take the liberty of , expel from , be pessimistic about
The parents were quite happy to[ ]our suggestion because had taked their most important concernsinto consideration.
【填空题】
enlighten, discard, restore, fluctuate,prejudice ,
profit , rival, motivate,implement, investigate
1When employees participated in the problem-solving process, they were muchvmore willing to [ ] solutions to the problems.___
【填空题】
enlighten, discard, restore, fluctuate,prejudice ,
profit , rival, motivate,implement, investigate
2 A strong police force has been placed between the two [ ]group in the village to prevent fighting and killing.___
【填空题】
enlighten, discard, restore, fluctuate,prejudice ,
profit , rival, motivate,implement, investigate
3 Although personally we believe this to be of only secondary importance, its potential role in [ ] innovative acts cannotbe.___
