毛细管柱气相色谱分析时,加尾吹的目的是什么?

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问题:

毛细管柱气相色谱分析时,加尾吹的目的是什么?

考点:环境监测上岗考试气相色谱法气相色谱法题库
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王先生夫妇生有一子王峰,2002年又将朋友的孩子小云落户在自己家。2003年王先生夫妇离婚,王先生带着小云与郑女士再婚,郑女士带来了一位15岁的男孩小明。则王先生的法定继承人是( )。

A.王峰

B.王峰、小云

C.王峰、郑女士

D.王峰、郑女士、小明

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(a) Mr Zhang, a Chinese citizen, is a University professor. He had the following income for the month of January 2009:(1) Monthly employment income of RMB 18,000 and a bonus for the year 2008 of RMB 12,000.(2) Income of RMB 18,000 for publishing a book on 6 January 2009. One of the chapters of the book was published in a magazine as a four-day series commencing on 19 January 2009 for which Mr Zhang received income of RMB 1,000 per day.(3) A net gain of RMB 12,000 from trading in the A-shares market.(4) Income of RMB 4,800 for giving four separate seminars for Enterprise X.(5) A translation fee of RMB 5,200 from a media publisher.(6) Received RMB 300,000 from the sale of the property (50 square metres) that he had lived in for six years.Mr Zhang had acquired the property for RMB 180,000.(7) Gross interest income of RMB 6,000 from a bank deposit.(8) Received RMB 11,000 as insurance compensation.Required:Calculate the individual income tax (IIT) payable (if any) by Mr Zhang on each of his items of income for the month of January 2009, clearly identifying any item which is tax exempt. (10 marks)

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请列举二级保养中对电子控制空气悬架系统主要检查项目。

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下列哪项指标不属于稀油式煤气柜密封油质量指标要求?()

A.运动粘度

B.油水分离性

C.密度

D.成分组成比例

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在社交活动中人们都会有心理防御本能。

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