影响铁水包使用寿命的原因主要有哪些?

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问题:

影响铁水包使用寿命的原因主要有哪些?

考点:火法冶炼工火法冶炼工题库
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某历史网站讨论有关凡尔赛——华盛顿体系的话题,其中表述不正确的是: (    )

A.暂时维持了和平局面

B.完全消除了帝国主义国家之间的矛盾

C.为再次爆发战争埋下了隐患

D.大大加深了各国之间的矛盾

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急性心肌梗死时多见的心律失常是

A.预激综合征
B.右束支传导阻滞
C.房室传导阻滞
D.房性期前收缩或心房纤颤
E.室性期前收缩或室性心动过速

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货币政策对宏观经济调控的作用,突出地表现在( )。

A.通过调节货币供应量保持社会总供给与总需求的平衡

B.通过控制利率和货币总量的控制,保持物价总水平的稳定

C.调节国民收入中消费与储蓄的比例

D.引导储蓄向投资的转化,实现资源合理配置

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Have you ever been bitten? Of course you have. You are surrounded by living things which might, or do, bite. Even when you rest your head on your pillow, bedbugs are probably nibbling away(蚕食) at you. They live happily inside most pillows.

Take a walk outside and you are a target for “man’s best friend. ” Hundreds of dog-bite victims visit US emergency rooms daily. Many bites are terrible. To avoid the dogs in your neighborhood, you might want to hike into the desert or the woods. There, you run the risk of bites from rattlesnakes, scorpions, and blood-sucking ticks. Not to mention bears, wolves, coyotes, and mountain lions.

Speaking of housing, watch out when you touch the corner of your house or garage. Shy but deadly, the black widow spider and the brown recluse spider make themselves comfortable in quiet areas of your closets or garage. One bite from either of them can make you very sick; occasionally, people die from such bites. Unfortunately, many people fear all spiders, not just the few dangerous ones. They squash them or run from them at first sight, not realizing that most spiders are actually beneficial to man.

If you’re concerned about bites, don’t forget about rabid(患有狂犬病的) animal bites. Any warm-blooded animal can get infected with rabies. Although humans in the US rarely get attacked by rabid animals, the disease is painful and dangerous. You will most likely die if you are not treated properly within 48 hours of being bitten.

小题1: How does the author introduce the topic of this passage?

A.By asking questions.

B.By giving examples.

C.By offering suggestions.

D.By doing experiments.小题2:According to the 2nd passage, “man’s best friend” is _____________.

A.Bedbugs

B.Dogs

C.Coyotes

D.Scorpions小题3:When you at home, you will probably be bitten by __________.

①rattle snakes   ②bedbugs  ③bears  ④spiders  ⑤rabid animals

A.①④

B.②③

C.③⑤

D.②④小题4:What can we infer from the 3rd paragraph?

A.All spiders are dangerous and one bite from each of them can be very serious. .

B.The black widow spider is actually beneficial to humans.

C.Spiders always make themselves comfortable in quiet place in your house.

D.One should squash a spider at first sight to keep safety.小题5:In the author’s opinion, __________.

A.No matter what kind of animal bites you, there is no danger at all.

B.One should treat rabid animal bites properly within 2 days.

C.Humans in the US can be bitten by rabid animals frequently.

D.Hundreds of rabid animal-bite people visit emergency room daily in the US.

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电动机滑动、滚动轴承允许的温度是多少?

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