of;
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Shijiazhuang,;
Hebei;
050043,;
China;
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of;
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and;
Railway;
Engineering;
Safety;
Control;
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Education,;
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Uni-;
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of;
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Beijing;
100044,;
China;
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China;
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Xi;
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Shaanxi;
710119,;
China;
反复冻融; 动态模量; 阻尼比; 粉砂; 性能; 动态应变; 动态弹性模量; 强度降低;