题目内容

Mr.Clive from an American company is visiting Blue-sky Mold, accompanied by Andrew Johnson, the production Manager. Listen to the conversation and fill in the blanks with what you hear.Andrew Johnson: Now this is the________ line that produces the machine tools, Mr.Clive.Mr.Clive: I have been very impressed by what I have seen. I know the factory is ____________ at full capacity.Andrew Johnson: Yes, we've received plenty of orders, both for_________ needs and for exports. As you know, we____________ machine tools of all types and sizes.Mr.Clive: Is any work done by subcontractors?Andrew Johnson: No, we are fully self-sufficient.We have laboratories, quality control department and____________5department all here.Mr.Clive: Have you been producting this new model for a long time?Andrew Johnson: Yes, we've introduced new technology and started a new model last year. Our designers always keep up with the _____________6 of technology.Mr.Clive: Is the __________7 of engineers big?Andrew Johnson: Totally we have about two hundred engineers.Mr.Clive: How do you ensure quality control?Andrew Johnson: Well, it is done by the Quality Control Department.Our quality control engineers ensure that all equipment manufactured is thoroughly inspected and___________8 in full the requirements of the orders technically.Mr.Clive: Do you also ______9 the packing?Andrew Johnson: Yes, but we've recently started to use packing companies too. Well, is there anything else you'd like to see?Mr.Clive: No, thanks.Andrew Johnson: Ok.Let's go to my office for a cup of__________10.

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三相可控整流电路应用场合

A. 负载容量较大
B. 要求直流电压脉动较小、易滤波时使用
C. 无直流磁化问题时
D. 输出电压谐波少时

三相电路触发角的起点,是以自然换相点来计算的,而不是以过零点。

A. 对
B. 错

三相半波可控整流电路电阻负载,α角的移相范围是160度

A. 对
B. 错

自然换相点:是三个相电压的交点,三相半波整流电路正反向三相电压均有自然换相点

A. 对
B. 错

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