三角带传动的选用,主要是确定三角带的型号、长度、根数和确定两带轮的直径及中心距。

题型:判断题

问题:

三角带传动的选用,主要是确定三角带的型号、长度、根数和确定两带轮的直径及中心距。

考点:高级钳工高级钳工题库
题型:判断题
完形填空。
     Two friends  1  a bear (熊) when they went through a forest  2 . One of them ran to  3  tree and
climbed up very quickly. He forgot his friend. He thought only of   4 . His friend  5  bears  6  dead (死的)
men.  7  he  8  when the bear came to him. Then the bear went away. The man called his friend in the tree," you can  9  now." The man smiled and asked,"What did the bear say to you?" His friend answered," He
said I needed a new  10 ."
( )1.A. looked for
( )2.A. by bus    
( )3.A. the nearest
( )4.A. himself   
( )5.A. knew      
( )6.A. wasn't like
( )7.A. And       
( )8.A. moved     
( )9.A. climb up  
( )10.A .teacher  
B. met        
B. by bike    
B. the good   
B. his mother 
B. thought    
B. needn't fine
B. So         
B. ran        
B. get up     
B. dress      
C. looked at     
C. on foot       
C. a taller      
C. the bear      
C. saw           
C. didn't eat    
C. But           
C. opened his eyes
C. stay there    
C. house         
D. watched       
D. by car        
D. a biggest     
D. his girl friend
D. watched       
D. couldn't touch
D. Because       
D. didn't move                       
D. come down     
D. friend        
题型:判断题

福利的内部调查主要是要了解市场上普遍存在的福利项目的形式、内容及其覆盖范围方面的信息。( )

A.对

B.错

题型:判断题

源程序的文档化不包括( )。

A.符号名的命名要有实际意义

B.正确的文档形式

C.良好的视觉组织

D.正确的程序注释

题型:判断题

某同学在“利用自由落体运动测重力加速度”的实验中,使用电磁式打点计时器打出的纸带如下:请回答下列下列问题

(1)打点计时器应采用____V的频率为50HZ的交流电源,相邻两点间的时间间隔为_____S。

(2)他在实验中进行了下列步骤,请给它们排序

A、将打点计时器竖直固定了铁架台上,连接好电路

B、接通电源

C、竖直释放纸带

D、将纸带一端与重锤固定,另外一端穿过打点计时器的限位孔.

E、重复以上步骤,再多打几条纸带,挑选点迹清楚的纸带进行数据处理

F、纸带通过打点计时器限位孔后,关闭电源.

你认为合理的顺序是______________________________________________

(3)他在做实验时,选用了以下器材:铁架台,打点计时器,学生电源,导线,纸带,重锤,还应选择

A.秒表          B.天平           C.刻度尺           D.弹簧秤

(4)依据以上数据,可求得D点的速度是_________ m/s,重锤的加速度是_________ m/s2

(5)实验测得的加速度比重力加速度略______(大或小),

你认为误差产生的原因是___________________________________________________.

题型:判断题

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