Hall―Pectch公式是（）
- Aσs=σ0+kd-1/2
- Bσs=σ0+kd-1/3-1/5
- Cσs=σ0+kd
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1955年美国的莉迪亚·海尔(L．Hall)首次提出的概念是（ ）A功能制护理B整体护理C责任制护理D以健康为中心的护理E以疾病为中心的护理
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"Town Hall is the tallest building in the city." "（）from here?"ACan it seeBCan it be seenCCan seeDCan be seeing it
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A lecture hall is（）where students attend lectures.AthereBwhichConeDthat
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6、结合Hall―Petch公式分析金属材料晶粒大小对强度的影响。
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