搜题请搜索小程序“爱下问搜题”
问题 单项选择题

定量订购控制法是指当库存量下降到预定的（）时，按规定补充库存的方法。

A.最低库存量

B.最佳库存量

C.最高库存量

D.平均库存量

答案

参考答案：A

阅读理解
根据材料内容从各题后所给的选项中选出最佳答案。
                                                               Guitar Player Wanted
       Are you a lover of music? Can you play the guitar? Can you sing or dance? Welcome to our Sunshine
  Rock Band. Please call Mike at 5487-6598 or send an e-mail to sunshine@yahoo. com.  
                                                                Hot Club
       Do you like to play table tennis? Do you want to play it well? Mr Zhang is a good teacher. You  can
  come here every Saturday afternoon from 2:30 to 5:30 Telephone:8665-7868  Address:Room105,
  Lantian Hotel.
                                                                Swimmer Wanted
       Can you swim? Do you like children? Can you teach them to swim on Sundays? Come and join  us.
  Call Joe at 8472-9999 for more information. 
                                                                Summer Job
       Do you like to talk with people? Do you like to write stories? Would you like to work for a magazine?
  Then come and work as a reporter. Please call Karen at 5561-8823.
1. If you want to join the Sunshine Rock Band, you should play the _____ well.    
A. piano        
B. guitar          
C. Drum          
D. violin
2. Who can teach you to play table tennis ?
A. Mike            
B. Joe            
C. Mr Zhang      
D. Karen
3. You want to play table tennis. Then you can go to Lantian Hotel on _____.    
A. Fridays          
B. Saturdays      
C. Sundays      
D. Mondays
4. You want to teach children to swim. Then you can call _____.
A. 5487 - 6598      
B. 8665 - 7868    
C. 8452 - 9999    
D. 5561 - 8823
5. The ads above may be from _____.
A. a newspaper    
B. a storybook      
C. science book    
D. a guidebook
查看答案
选择题

一试剂瓶中装有甲和乙两种物质的混合物，已知甲和乙的某些性质如下表：

物质化学式熔点：℃沸点：℃密度：g·cm-3溶解性
甲C3H6O2-9847.50.93溶于水和有机溶剂
乙C4H8O2-84770.90溶于水和有机溶剂
据此，将甲和乙互相分离的最佳方法是

A. 萃取        B. 过滤       C. 蒸馏           D. 洗气
查看答案