http://www.chinarank.org.cn/
回答: 内力是材料内部所受的力,它的产生来自于外界作用和物体内维持自身完整性的力。外界作用可以是外力,也可以是物理作用、化学作用,如冷热
由 marketreflections
于 2011-03-17 10:32:59
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