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The phase constitutions （） these ashes were investigated using X-ray diffraction.
The phase constitutions （） these ashes were investigated using X-ray diffraction.
A.on
B.for
C.of
D.at
正确答案：of
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研究生英语科技论文写作
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The chemical compositions of the four ashes, obtained （） EDX data, are shown in Fig. 1.
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Transmittance spectra of the heat reflector were measured （） the wavelength range of 300 nm to 2000 nm at normal incidence.