灯泵YAG激光打标机开机步骤?

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问题:

灯泵YAG激光打标机开机步骤?

考点:激光能激光加工技术激光加工技术题库
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第四部分书面表达(共两节,满分35分)

第一节根据汉语提示填入正确的单词使句子完整(共10小题上,每小题1分,满分10分)。

I began to show interest in American ________(文学) in 1998.

A three-minute silence was held as a mark of _________(尊敬).

Every student who ________ (参加) the lecture given by the hero yesterday must hand in a report.

In order to achieve high ______(成绩), Jack works very hard at all his lessons.

Don’t ________(放弃) English even if you are not interested in it, for it will be helpful to you.

I’m so envious of you getting an __________(额外的) day’s holiday.

We have a new manager. Our ________(以前的) manager quitted his job last week.

The children in that school _________(捐赠)many schoolbags to those in the disaster area.

His latest painting is being ________(展览)at the exhibition.

Much attention should be paid to _________(发展)science and technology.

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下列叙述正确的是(   )

A.直径介于1~100nm之间的粒子称为胶体

B.胶体粒子很小,可以透过半透膜

C.向煮沸的1mol/L的NaOH溶液中,滴加FeCl3饱和溶液可制备Fe(OH)3胶体

D.医疗上的血液透析利用胶体的性质,而土壤保肥也与胶体的性质有关

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女性,22岁。既往间断上腹痛,伴反酸、胃灼热等症状,常于进食后好转。1天前出现黑便,无呕血,辅助检查示便潜血(+++),因此诊断为上消化道出血。其病因最可能为()

A.急性胃炎

B.慢性胃炎

C.十二指肠球部溃疡

D.反流性食管炎

E.食管贲门黏膜撕裂

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能把稀盐酸、水、氢氧化钠溶液三种无色液体一次性区别出来的物质是(  )

A.碳酸钠

B.硫酸铜

C.氯化钠

D.石蕊试液

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为适应网络带宽和降低存储器存储容量的要求,科技工作者开发了许多算法,用于压缩各种各样的数据。假设处理系统的计算精度足够高,由此造成的数据损失可忽略。其中,量化(Quantization)()。

A.对重构图像的质量有损失

B.对重构图像的质量没有损失

C.量化前后数据项的数目不相等

D.量化阶大小不会影响图像质量

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