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【单选题】
颞下颌关节疾病中最为多见的疾病是A.
颞下颌关节炎
B.
颞下颌关节紊乱病
C.
颞下颌关节脱位
D.
颞下颌关节强直
E.
翼外肌痉挛
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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
【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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