中国牵头制定的首个纳米金刚石国际标准发布

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英伟达市值五个月暴涨 6300 亿美元，估值反而下降，有投行看多，有分析师唱空，股价究竟贵了还是便宜？

　　中国农业科学院农业资源与农业区划研究所研究员姜文来向中新社国是直通车表示，河南省是中国十三个粮食主产区之一，小麦品质也很好，是全年国家粮食收获的重要部分，同时，作为粮食大省，麦收收入是当地农民的主要收入来源，尤其是在收获季节，农民对小麦收成情况更加敏感。