【判断题】
(32061)根据图样或实物的尺寸，在毛坯或工件上，用划线工具划出加工轮廓线和点的操作叫划线。(1.0分)
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相关试题
【判断题】
(32062)划线基准应与设计基准一致，但，划线时不一定从基准线开始。(1.0分)
【判断题】
(32063)进行锉削前，应将工件装夹在台虎钳钳口的中间，加工的工件面应与钳口持平。(1.0分)
【判断题】
(32064)錾削主要对难以机械加工的场合进行，錾削的主要工具是錾子和手锯。(1.0分)
【判断题】
(32065)钻孔时，先使钻头对准钻孔中心起钻出一浅坑，观察钻孔位置是否正确。(1.0分)
【判断题】
(32066)铰孔时，铰刀不能反转，退出时才能反转。(1.0分)
【判断题】
(32067)因为刮削工作的劳动强度不大，所以要求工件在机械加工后留下的刮削余量可大可小。(1.0分)
【判断题】
(32068)套螺纹前，圆杆端部应倒成15°—20°的锥角，圆杆直径应稍大于螺纹大径的尺寸。(1.0分)
【判断题】
(32069)用丝锥加工螺纹时，螺纹底孔直径应大于螺纹小径。(1.0分)
【判断题】
(32070)套螺纹前，圆杆端部应倒成15°—20°的锥角，圆杆直径应稍大于螺纹大径的尺寸。(1.0分)
【判断题】
(32071)装配时，固定连接的零部件，允许有间隙。活动的零件，能在正常的间隙下，灵活均匀地按规定方向运动，不应有跳动。(1.0分)
【判断题】
(32072)不同机件磨损情况不同，故磨损规律也不同。(1.0分)
【判断题】
(32073)半导体中多数载流子的浓度是由掺杂浓度决定的。(1.0分)
【判断题】
(32074)在运算放大器的运用电路中，若存在反馈则运放工作在线性状态。(1.0分)
【判断题】
(32075)电路中并联的阻抗越多，电路的阻抗就越小。(1.0分)
【判断题】
(32076)刻度为有效值的电压表只能正确测量正弦电压的大小，而不能测量非正弦电压的大小。(1.0分)
【判断题】
(32077)键联接可以实现轴上零件的轴向固定。(1.0分)
【判断题】
(32078)PT燃油系统中PT燃油泵和喷油器是利用机油润滑的。(1.0分)
【判断题】
(32079)柴油机是内燃机中的一种，而内燃机又属热机中的一种。(1.0分)
【判断题】
(32080)在1FC5系列发电机中，短接F1和F2将造成发电机端电压降低至360V左右。(1.0分)
【判断题】
(32081)三相异步电动机的转速取决于电源频率和极对数，而与转差率无关。(1.0分)
【判断题】
(32082)当发电机组的充磁、灭磁开关打到充磁位时，将造成发电机端电压低于400V。(1.0分)
【判断题】
(32083)柴油机能混合使用不同牌号的机油。 (1.0分)
【判断题】
(32084)柴油机是点燃式内燃机。(1.0分)
【判断题】
(32085)维修柴油机时连杆盖与连杆体一般成对使用，不能单件调换。(1.0分)
【判断题】
(32086)微机断电后，机器内部的计时系统将停止工作。(1.0分)
【判断题】
(32087)在微机中，Alt和Ctrl键不能单独使用，只有配合其他键使用才有意义。(1.0分)
【判断题】
(32088)在微软操作系统的微机中，多任务使用多窗口时，每一时刻只有一个任务在运行，其它任务属于挂起状态。(1.0分)
【判断题】
(32089)在微软操作系统的微机中，从“EDIT”菜单里，选择“复制”是用来复制已选定的文本，并将其放到剪贴板上。(1.0分)
【判断题】
(32090)使用办公软件的Excel，“打印预览”在“视图”菜单栏内。(1.0分)
【判断题】
(32091)在微软的OFFICE办公软件中，最近使用过的文档在文件菜单显示。(1.0分)
【判断题】
(32092)TTL逻辑门电路是以晶体管为基本器件构成的集成电路。(1.0分)
【判断题】
(32093)COMS集成门电路集成度高，但功耗较高。(1.0分)
【判断题】
(32094)使用指针式万用表测里多个电阻时，只需选出合适量程档，进行一次机械调零、欧姆调零即可。(1.0分)
【判断题】
(32095)计量的三个主要特征是统一性、准确性和法制性。(1.0分)
【判断题】
(32096)电阻串联后的总电阻一定大于其中任何一个电阻的阻值。(1.0分)
【判断题】
(32097)功率大的电灯一定比功率小的电灯亮。(1.0分)
【判断题】
(32098)正弦量的三要素是最大值、频率和相位。(1.0分)
【判断题】
(32099)只要闭合电路内有磁通量，闭合电路中就有感应电流产生。(1.0分)
【判断题】
(32100)线框不闭合时，若穿过线圈的磁通量发生变化，线圈中没有感应电流，但有感应电动势。(1.0分)
【判断题】
(32101)热继电器在电路中既可作短路保护，又可作过载保护。(1.0分)
推荐试题
【单选题】
18. Helen ______ to a language school when she was seven.
A. sent B. is sent C. will send D. was sent
【单选题】
19. — Is this park youve visited recently?
— Yes, it's the most beautiful one Ive ever visited before.
A. that B. the one C. which D. the one which
【单选题】
20. — Its difficult for the village children to cross the river for school.
— I think a bridge ________ over the river.
A. should be built B. is being built C. has been built D. was built
【单选题】
21. — Could you tell me when Mr. Li ________ in Huaibei?
— Sure．．When he ________, I’ll call you．
A. arrives; will arrive B. will arrive; will arrive
C. arrives; arrives D. will arrive; arrives
【单选题】
22.There is ________ 800-metre-long road behind ________ hospital．
A. an; an B. an; the C. a; a D. a; the
【单选题】
23. — Did you see a girl in yellow pass by just now?
— No, sir. I ________ a magazine.
A. read B. am reading C. was reading D. would read
【单选题】
24.In fact, my parents are not only kind to me, but also strict ________ me.
A. at B. to C. for D. with
【单选题】
25. The boy_____ a yellow sweater can_____ himself now．
A. wearing; dress B. putting on; wear C. put on; dress D. dressing;
【单选题】
( ) 26. Where does the writer of "The little Prince" come from?
A．England． B．France． C．America． D．China．
【单选题】
( ) 27. What does the prince do after the fox tells him a secret?
A．He cares more about a flower and a sheep．
B．He meets many more strange adults on other planets．
C．He realizes his love for the rose and he goes back to his planet．
D．He discovers interesting things such as a snake, other roses and a fox．
【单选题】
( ) 28. What does "The little Prince" mainly talk about? It' s about _________．
A．the adult world B．the planet B -612
C．a rose and a fox D．the adventure of a young
【单选题】
( ) 29. When a baseball player hits the ball, he must ______ to get a point.
A. run to each base freely
B. touch the home plate first
C. touch all the bases with his hands
D. run to each base in order and touch it with his foot
【单选题】
( ) 30. When was the importance of touching all the bases shown?
A. Before the baseball rules made.
B. At the end of the 1974 baseball seasons.
C. At the start of the 1974 baseball seasons.
D. In the second week of 1974.
【单选题】
( ) 31. Who hit home run number 715?
A. Babe Ruth. B. Hank Aaron. C. Babe Ruth’s partner. D. Hank Aaron’s friend.
【单选题】
( ) 32. What does the expression “to touch all bases” mean?
A. To try your best to set a new record.
B. To get a chance to be the greatest hitter.
C. To do what is needed to finish an activity.
D. To solve the problems successfully.
【单选题】
( ) 33. The Chinese Yellow Sea Wetlands are in the _______ of China．
A．south B．east C．west D．north
【单选题】
( ) 34. Usually the weather in the wetlands is _______．
A．hot B．pleasant C．cold D．dry
【单选题】
( ) 35. The World Wetlands Day is on _______．
A．February 2 B．June 25 C．April 22 D．March 22
【单选题】
( ) 36. We must protect wetlands because _______．
A．they are home for wildlife B．they can prevent flood
C．they can offer food to the animals and birds D．all of the above
【单选题】
( ) 37.The greatest river for navigation is ___________.
A. the Nile B. the Amazon C. the Mekong D. the Mississippi
【单选题】
( ) 38. From a dam, people can use the water for ___________.
A. keeping the rivers clean B. only making electricity
C. irrigation and making electricity D. washing clothes
【单选题】
( ) 39. The water in the river is polluted because of _____________.
A. people's drinking water too much B. people's swimming in the river too much
C. chemicals and other materials D. people's building a dam across a river
【单选题】
( ) 40. The best title of the passage is ___________.
A. Rivers in Cities B. The importance of Rivers
C. Transportation D. Natural Resources
【单选题】
1.—Hello! This is Henry Speaking．I’d like to speak to your father．
—Sorry, he has Shanghai．
A. been in B. been to C. come to D. gone to
【单选题】
2. — It’s difficult for the village children to cross the river for school．
— I think a bridge ______ over the river．
A. was built B. is being built C. has been built D. should be built
【单选题】
3. —Where would you like to go, Jinan or Qufu?
— ．I only want to go to Qingdao．
A. Each B. Either C. Neither D. All
【单选题】
4. — The documentary A Bite Of China II is quite popular around China recently. How do you like it? — ______.
A. I think so B. Pretty good C. It’s my pleasure D. All right
【单选题】
5. There are three English-books on the shelf, but ______ of them is mine.
A. both B. neither C.all D. none
【单选题】
6. When the parents arrived at the hall, the students _______ their projects.
A. have finish B. finished C. had finished D. are finishing
【单选题】
7. This week, the _______ seems to change every day: one day is hot; the next day is cold.
A. time B. weather C. season D. way
【单选题】
8. He never does his work _______ Mary.
A. as careful as B. so careful as C. carefully as D. as carefully as
【单选题】
9. — Can he jump high?
— Yes, he ______. He is a good high jumper.
A. must B. need C. can D. shall
【单选题】
10. The shop _____ at 8:00 a．m．and it ________ for ten hours every day．
A. is open; has opened B. is opened; opens
C. opens; is open D. opened; opens
【单选题】
11. —Excuse me, may I use your bicycle? ______ is broken.
—Certainly. But remember to return it before lunch.
A. Mine B. Me C. Myself D. I
【单选题】
12. —Simon, what do I need to take for the hiking?
—You’d better ________ more water than usual. It’s hot today.
A. to take B. taking C. take D. took
【单选题】
13. Helen ______ to a language school when she was seven.
A. sent B. is sent C. will send D. was sent
【单选题】
14. — Is this park you’ve visited recently?
— Yes, it's the most beautiful one I’ve ever visited before.
A. that B. the one C. which D. the one which
【单选题】
15. — It’s difficult for the village children to cross the river for school.
— I think a bridge ________ over the river.
A. should be built B. is being built C. has been built D. was built
【单选题】
16. — Could you tell me when Mr. Li ________ in Huaibei?
— Sure．．When he ________, I’ll call you．
A. arrives; will arrive B. will arrive; will arrive
C. arrives; arrives D. will arrive; arrives
【单选题】
) 17.There is ________ 800-metre-long road behind ________ hospital．
A. an; an B. an; the C. a; a D. a; the
