杨涛教授：您是说糖尿病发病前存在一过性的病毒感染吗？
Prof. Yangtao: the there may be a transient virus infection before the onset of diabetes?
杨涛称，在这个时候，产品毛利率高以及多元化经营的煤炭企业受影响的程度相对要小。
Yang Tao said that, at this time, high-margin products as well as the diversification of the coal enterprises to be affected are relatively small.
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