开启液色谱仪时,应首先()。A、开主机电源 B、开泵电源 C、开检测器电源 D、开柱温箱电

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问题:

开启液色谱仪时,应首先()。

A、开主机电源

B、开泵电源

C、开检测器电源

D、开柱温箱电源

考点:质量通道任职资格考试理化专业验证(二级)理化专业验证(二级)题库
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在Rt△ABC中,∠C=90°,AC=5,BC=4,则tanA=______.

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七边形的内角和等于 _________ 度.

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保持呼吸道通畅最可靠的方法是()

A.口咽通气道

B.鼻咽通气道

C.气管内插管

D.喉罩

E.上抬下颌

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SOX is an alternative syntax for (71) . It is useful for reading and creating XML content in a text editor. It is then easily transformed into proper XML. SOX was created because developers can spend a great deal of time with raw XML. For many of us, the popular XML (72) have not reached a point where their tree views, tables and forms can completely substitute for the underlying. (73) language. This is not surprising when one considers that developers still use a (74) view, albeit enhanced, for editing other languages such as Java. SOX uses (75) to represent the structure of an XML document, which eliminates the need for closing tags and a number of quoting devices. The result is surprisingly clear.

A.SOA

B.UDDI

C.XML

D.Web Service

题型:单项选择题

何时应用静态离子交换分离法?

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