问答题

Mass Spectrometry（MS）is the science of displaying the spectra of the masses of the（）comprising a sample of　material.

答案： A.atoms
B.molecules
C.ions
D.cations
正确答案：molecules

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（）is a quantitative spectroscopic technique that measures the elemental composition, empirical formula, chemical state　and electronic state of the elements that exist within a material.

答案： A.XRD
B.EDS
C.IR
D.XPS
正确答案：XPS

Before carrying out the characterization, one vital procedure is（）

答案： A.forming
B.sampling
C.casting
D.forging
正确答案：sampling