小测验：选择正确的单词

1. simple closed curve
   [数]简单闭曲线(指不自交的一条闭曲线,亦作Jordan curve)
   
2. closed chain
   固定链系
   
3. closed circuit
   闭合电路，闭合环路，通路
   
4. closed corporation
   封闭式公司
   
5. closed curve
   闭合曲线，闭曲线，封闭曲线
   
6. closed fracture
   闭合性骨折，单纯骨折，无创骨折
   
7. closed loop
   闭合环路，闭合循环，闭合循环回路，闭环，闭循环
   
8. closed shop
   封闭性工厂，排外性雇佣制企业，应用程序站，闭式工厂，不开放计算站
   
9. closed-end fund
   限额基金
   
10. closed-end investment company
    封闭型投资公司
    
11. closed book
    n. 一无所知的东西 已结束的事（计划、行动等）
    
12. closed session
    【法】 禁止旁听的开庭
    
13. closed interval
    闭区间
    
14. closed-loop system
    【计】 闭环系统
    
15. closed-circuit television
    闭路电视
    
16. closed universe
    闭宇宙
    
17. closed primary
    【法】 闭锁式初选, 排他性预选
    

1. Their school is in close proximity to the park.
   他们学校紧靠公园。
2. The door closes quietly.
   这门关起来不发出什么声音。
3. A fairly close resemblance;an approximation.
   接近相当近似;接近
4. She is a close friend of theirs.
   她是他们的挚友。
5. Please oblige me by closing the door.
   请替我关上那个门。

　9个形容词解释