问题描述：
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本文利用透射电镜和X-射线的衍射技术，对酸雨危害较为 严重的重庆市区大气颗粒物样品进行了较为细致的研究工作。（）
A．Transmission electron microscope and X-ray diffraction were used to study air-borne particulates collected in Chongqing, Sichuan Province, which are seriously damaged by acid rain.
B．By using transmission electron microscope and X-ray diffraction method, studies were carried out on samples of air-borne particulates collected in Chongqing, Sichuan Province, where are seriously suffered from acid rain.
C．Using transmission electron microscope and X-ray diffraction method, we have studied samples of air-borne particulates collected in Chongqing, Sichuan Province, which are seriously suffered from acid rain.
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