Both the data of nature earthquakes and experiments in laboratory show that the relation between magnitude and logarithm of frequency is not a rigid straightline.
天然地震资料和实验室资料均表明，震级与频度对数之间的关系不是一条严格的直线。
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The company now has six high-frequencystraight seam welded pipe units, three hot-dip galvanizing line.