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【单选题】
下述抗菌药物的给药方法中错误的是( )。A.
在抗菌药物应用过程中，应注意防止严重过敏和毒性反应的发生
B.
用药过程中，要严密观察各种反应，并做及时处理
C.
如拟应用抗菌药物来预防手术后感染，一般术前和术中给抗菌药物各一次，术后继续用1～2日
D.
术后应用抗感染药物对预防感染的效果较差
E.
所有手术常规预防性应用抗感染药物
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【简答题】纺织纤维如何分类?
【单选题】The purpose of the ashing step in graphite-furnace atomic-absorption spec-troscopy is to（）
A.
Vaporize metal atoms to be analyzed
B.
Cause the metal species to form carbides which are more volatile
C.
Convert the graphite furnace to ash to avoid carbide formation
D.
Burn off organic species that would interfere with the elemental analysis
【判断题】The main analytical techniques used for determination of trace elements in environmental samples include: Atomic absorption spectrometry (flame or electrothermal) (AAS, ET-AAS), atomic fluorescence sp...
A.
正确
B.
错误
【简答题】Atomic Emission Spectroscopy
【单选题】In ______, Erwin Müller, working at Siemens Research Laboratory, invented the field emission microscope, allowing near-atomic-resolution images of materials.
A.
1926
B.
1932
C.
1936
D.
1946
【单选题】Which of the following is the function of the atomizer in the emission system of Atomic Absorption Spectroscopy?
A.
To split the beam into two
B.
To break the steady light into pulsating light
C.
To break large mass of liquid into small drops
D.
To reduce the sample into atomic state
【简答题】纺织纤维按纤维的物理属性是如何分类的?
【单选题】Which electronic transition in atomic hydrogen corresponds to the emission of visible light?
A.
from n = 5 to n = 2
B.
from n = 1 to n = 2
C.
from n =3 to n = 4
D.
from n = 3 to n =1
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