试述焊接区内氢气的来源?它有什么危害?如何控制?

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问题:

试述焊接区内氢气的来源?它有什么危害?如何控制?

考点:电焊工考试中级电焊工考试中级电焊工考试题库
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青少年时代的周恩来学习十分认真。他在南开中学读书的时候,有一次,校长把同学们召集起来,问大家:“读书为了什么”?同学们的回答各不相同,有的回答为了发财;有的回答为了帮助父母记账;等等。这时,周恩来站起来,朗声作答:“为中华崛起而读书。”

阅读上述材料,回答:

(1)周恩来的回答体现出了一种什么情感?

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(2)在日常生活中,我们应该如何培养这种情感?

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下列各项叙述中,属于大气污染物排放口考桉中应注意的问题的有( )。

A.位于两控区内的锅炉,除执行锅炉大气污染物排放标准外.还应执行所在区规定的总量控制指标

B.最高允许排放浓度及最高允许排放速率均指连续24小时采样平均值或24小时内等时间间隔采集样品平均值

C.对无组织排放的点源,应对照行业要求考柱监控点与参照点泉度差值或周界外最高浓度点浓度值

D.实测烟尘、SO2、NOx的排放琅度应根据实际情况分别按照标准要求换算为相应空气过剩系数、出力系数、炉型折算系数、掺风系数时的值后再与标准值比较

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Dear Kate,
I am writing to you in English. I hope you can understand it.
I love studying in London and      1     . Most of them are my classmates. From Monday to Friday, we have Chinese, math, physics and P.E. in the morning. I like Chinese and physics,       2       . I don’t like math. It’s too boring. At noon, I have to have lunch at school         3        . We usually have two classes in the afternoon, art and politics. We finish our classes at 3:30 p.m. After school, my friends and I always play soccer on the playground. And then we go home by bus.
On weekends,        4        . We often go to the park and sometimes we go to the movies in the evening.         5         . I like some famous stars like Jackie Chan.
Oh, I have no time to write more. Please write back soon.
Best wishes,
Wang Gang
A. we have no classes.
B. We see movies twice a month.
C. I have many new friends.
D. because they’re interesting.
E. because my home is far from my school.
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什么是电度电价?

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在发布广告时,对广告主和广告经营者的要求是()。

①要遵守广告法的规定

②要受反不正当竞争法的约束

③属企业行为,以营利为目的,法律要求可以不管

④广告的经营者不得在明知或者应知的情况下,代理、设计、制作、发布虚假广告

A、①②③

B、①②④

C、①③④

D、②③④

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