弧坑产生原因是熄弧停留时间()。

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问题:

弧坑产生原因是熄弧停留时间()。

考点:建设工程技术与计量(安装工程)第一节切割和焊接第一节切割和焊接题库
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布氏杆菌病等人畜共患疾病()

A.做好检疫隔离、疫情预报、疫源地消毒、预防接种和个人防护

B.防霉和防尘,加强个人防护和定期健康监护

C.诱蛾、捉虫、杀虫,作业时注意个人防护

D.治疗钩虫病患者,粪便封存无害化使用,穿鞋袜、长裤作业

E.结合施肥消灭椎实螺,粪便无害化处理和个人防护(涂5%松香凡士林软膏)

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¥1680.32的写法:

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According to a famous optical(光学) expert, Alexander, who recently visited Shanghai, the developed countries in Europe and America have made rules that children must wear resinous(树脂) glasses instead of the traditional glasses made of glass. This is because the glass glasses are more likely to do harm to children’s eyesight.

Alexander pointed out: wearing the right glasses as soon as possible is still the best way to cure and put right children’s eyesight problems.

In America and Japan the resinous glasses have taken up 80 percent of the glasses market. And some European countries and America have made it a law that children, teenagers and drivers must wear resinous glasses. Now, about 10 million children in China have different eyesight problems and they need timely treatment.

But still, too many parents are buying the traditional glass glasses for their children. This is mainly because many parents know little or nothing about the good points of the resinous glasses. Besides, the price for the new glasses is a little higher than the traditional ones.

小题1:This news article mainly wants to tell us _______.

A.Alexander visited China and introduced a new type of glasses

B.we should wear resinous glasses instead of glass glasses

C.resinous glasses are popular in Europe and America

D.glasses can be made of other materials instead of glass小题2:According to Alexander, the “timely treatment” to eyesight problems is _______.

A.to stop wearing glass glasses any more

B.to buy a pair of glasses and wear them right away

C.to wear suitable resinous glasses at the right time

D.to buy glasses made in Europe, Japan or America if possible小题3: It can be inferred from this news text that _______.

A.resinous glasses are not on sale in China yet

B.resinous glasses are not acceptable in China

C.glass glasses have disappeared on western market because there is a law against them

D.glass glasses are the first choice in China not only because of their price

题型:填空题

()是科学的膳食。

A、吃杂食

B、单一膳食

C、固定口味

D、偏食

题型:填空题

若N="123.45",则执行命令?67+&N的结果是()。

A、67123.45

B、190.45

C、67+&N

D、124

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