钢材的冲击韧性和哪些因素有关?
钢材的冲击韧性与①钢材质量、②试件缺口状况、③加载速度、④温度、⑤钢材厚度有关。其中温度越低、钢材厚度越大,其冲击韧性越差。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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