简述如何避免电源频率变化对红外线气体分析仪造成的影响。

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问题:

简述如何避免电源频率变化对红外线气体分析仪造成的影响。

考点:在线分析仪表工在线分析仪表高级工在线分析仪表高级工题库
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阅读理解。

     Mr Wu was a happy man, "I am sure my family is one of the oldest in the country." He often told the

people, "It has a long history."One day he went to see a great woman of family history, Mrs Li. "I want

you to find out everything about my family," he said. "Where do we come from? Who was the first? Do

I have any rich relatives?"

     "OK" Mrs Li said, "but you will pay $2,000."Mr Wu thought $2,000 was a lot of money, But he

said, "All right, But I want all of my family."She agreed and said, "Come back in three months."Three

months later, Mr Wu visited Mrs Li again. "Well," he said. "did you find anything about my family?"

"Yes," she said. " It is really a very interesting family. But my price is now $5,000." "$5,000!" Mr Wu

shouted. " But you told me the money was only $2,000." "I know. It was $2,000 to find out about

your family," She said. "It's another $3,000 to keep the secret about what I found out."

1. Mr Wu thought his family was _____.

A. an old family          

B. one of the oldest in the country

C. a happy one                

D. an unhappy one

2. One day he went to see a _____ of family history.

A. woman  

B. man          

C. great man  

D. great woman

3. Why did he went to see Mrs Li?

A. He wanted to find out everything about his family.

B. He wanted to know where they came from.

C. He wanted to know who was the first Wu

D. He wanted to know if there were some famous people in the family.

4. _____ later, Mr Wu visited Mrs Li again.

A. two months  

B. three weeks  

C. three years    

D. three months

5. At last, Mr Wu _____

A. didn't know about his family  

B. knew his family  

C. know all about his family  

D. didn't know anything about his family

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已知函数f(x)=2sinx+1.
(1)设常数ω>0,若y=f(ωx),在区间[-
π
2
3
]上是增函数,求ω的取值范围;
(2)当x∈[-
π
6
3
]时,g(x)=f(x)+m恰有两个零点,求m的取值范围.
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采取安全防护措施并用远距离爆破揭开或穿过煤层。

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不需中国人民银行颁发开户许可证的账户类型有()。

A.基本存款账户

B.一般存款账户

C.专用存款账户

D.临时存款账户

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患者男性,37岁,农民。主诉:发热、乏力、腿痛7天,并咳嗽、咳痰带血。查体:球结膜充血,腋下、腹股沟淋巴结肿大,腓肠肌明显触痛,双肺下野偶闻细小水泡音。既往身体健康,近期曾参加秋收。

为明确诊断应行下列哪项检查()

A.血常规

B.尿常规

C.胸片

D.血培养

E.痰培养

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