B.Technical Terms.（30）
1 CAM system programming( ) 2 servo system ( )
3 open loop system ( ) 4 servo motor ( )
5 drawing instrument ( ) 6 part drawing ( )
7 on-board ( ) 8 machine control unit ( )
9 hard wire ( ) 10 drive motor ( )
11 tool changer ( ) 12 tool path ( )
13 conversationzl programming ( ) 14 tool path plot ( )
15 manual programming ( )
C.Finish the dialogue.（20）
Jone:Do you have （ ）idea about servo systems?
Mary:Yes.I have ( ) idea ( ) it. The ( ) common servo control system in use are the open loop and the closedloop system.
Jone:Oh,I see. Well, what’s the difference ( ) them?
Mary:An open loop system utilizes stepping motors to create machine movements ( ) a closedloop system uses servo motors to execute machine movements.
Jone:Could you tell me ( ) about open loop systems?
Mary:Yes, of course. Open ( ) systems have recently gained renewed interest ( ) CNC applications.
Jone:Thank you very much ( ) your help.
D. Translation. (40)
1. --Do you know who invented the CAD software?
--Sorry, but I know this software is very helpful in drawing.
2. --How often do you communicate with you parents in US?
--We have a net chat each day through QQ.
3. --Will you please tell me something about Computer-aided manufacturing?
--Certainly. CAM is a system of using computer technology to assist the manufacturing process.
4. –-Do you have any idea about CAD/CAM system?
--The system takes the computer-generated design and feeds it directly into the manufacturing system..
5. –Through the use of CAM , a factory can become highly automated.
--Thanks for your clear explanation.
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