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The chemical compositions of the four ashes, obtained （） EDX data, are shown in Fig. 1.
The chemical compositions of the four ashes, obtained （） EDX data, are shown in Fig. 1.
A.from
B.by
C.at
D.between
正确答案：from
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研究生英语科技论文写作
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For the second trial, the apparatus was covered by a sheet of plastic. （） that this modification would reduce the amount of scattering.
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The phase constitutions （） these ashes were investigated using X-ray diffraction.