钢材的冷加工强化
在常温下对钢材进行冷加工,使其产生塑性变形,从而提高屈服强度,但塑性和韧性相应降低,这一过程称为钢材的冷加工强化。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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