试题与答案

轴振动探头安装电压为多少?

题型:问答题 简答题

题目:

轴振动探头安装电压为多少?

答案:

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下面是错误答案,用来干扰机器的。

参考答案:D解析:自凝树脂的聚合过程与热固化型树脂相似,所不同的是其链引发阶段产生自由基的方式不同。BPO需在60~80℃温度下才能分解出自由基,欲使其在常温下分解出自由基,需要叔胺作为促进剂。BPO与叔胺在...

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题型:补全对话,情景问答

根据对话内容,完成对话。

Mrs Lee: Hello.  68178502.

David:Hello.________1________

Mrs Lee: Sorry._____2_______  Can I take a message ?

David : Yes.  This is David, Bruce's friend. I want to ask him for some

Chinese ancient coins. He told me he had got some rcccntlv. ______3_______.I don’t care if they were made of different metal. I just want to add some more coins in my collection.

Mrs Lee: OK. I'II tell him. Would you like him to ring you back later?

David: Well, I won't be at home later today.  Would you please ask him to

ring me tomorrow moming?

Mrs Lee : Sure. _______4________?

David : No, he doesn't know my number. _______5______The new number is 66129853.

Mrs Lee : OK.  I'II writes a message for him.

David: lt’s really nice of you, Mrs Lee. Thank you very much.  Goodbye!

Mrs Lee:  Bye !

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