试题与答案

块度合格率是指合格量与()。

题型:填空题

题目:

块度合格率是指合格量与()。

答案:

被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0826/f6503e3eb080420ab7bf8c9b1698334c.html

下面是错误答案,用来干扰机器的。

参考答案:A

试题推荐
题型:完形填空
完形填空。
     What should we do to stay healthy?
     One important rule is to exercise   1  . The Lee's family try to exercise every day. Lee Fang   2   exercise
in the morning because he must be at his job at exactly seven o'clock. But he runs every evening. He would
rather run than watch TV. He walks a lot,   3  . He walks to school every day, and after school he   4   
different sports with his friends. Lee Fang goes to a yoga (瑜伽) class   5  . 
    But it wasn't   6   this way. Last year Mr. and Mrs. Lee used to   7   everywhere, even to the drugstore
(药店) two blocks (街区) away. They thought they had to use the car all the time. They wouldn't walk. The
Lee's all   8   better now. And they believe you mustn't be lazy. You   9   exercise every day. But you should
 10  to get in shape and stay in shape (身体健康).
( )1. A. often      
( )2. A. may not    
( )3. A. either    
( )4. A. watches    
( )5. A. in two weeks 
( )6. A. always    
( )7. A. ride     
( )8. A. had       
( )9. A. needn’t   
( )0. A. try       
B. sometimes  
B. can not   
B. also      
B. plays    
B. for two weeks   
B. seldom    
B. drive    
B. make      
B. don’t      
B. want      
C. late            
C. would          
C. too            
C. loves         
C. after two weeks  
C. usually        
C. fly           
C. feel           
C. won’t have to   
C. wish           
D. later          
D. should not     
D. again        
D. practises    
D. twice a week                 
D. sometimes      
D. walk           
D. feel like    
D. mustn’t       
D. hope           
查看答案
题型:填空题

(1)我国首创的海洋电池,总反应为:4A1+3O2+6H2O=4A1(OH)3,负极为:______,负极发生:

________反应(填“氧化”或“还原”);正极为铂网, ________(填“电子”或“电流”)从铂极流出;海水为电解质溶液,海水中的Na+移向________(填“正极”或“负极”)。若电路中转移3mol电子,则负极材料质量减少___________克

(2)航天技术使用氢氧电池具有高能、轻便,不污染优点,氢氧燃料电池有酸式和碱式两种,它们放电时的电池总反应式均可表示为:2H2+O2 = 2H2O。酸式氢燃料电池的电解质是酸,其负极反应为:

2H2-4e-= 4H+,则正极反应为____________________;碱式氢氧燃料电池的电解质是碱,其正极反应表示为:O2+2H2O+4e-= 4OH-,则负极反应为:_____________________。

(3)如图:若A为铜片,B为铁片,电解质为FeCl3溶液,则作铜片为______极(填正或负),写出电极反应式:正极_________________________负极__________________________

查看答案
微信公众账号搜索答案