钢材的脆性临界温度
钢材的冲击韧性随温度的降低而下降,当达到一定温度范围时,突然下降很多而呈脆性,此时的温度称为钢材的脆性临界温度。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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