分级回火
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one-step ageing 单级时效
two-step ageing 双级时效
step ageing treatment [机] 分级时效处理
two step ageing 二段分级时效
multi-step ageing 多级断续时效
step ageing process 分级时效工艺
interrupted multi-step ageing process 多级断续时效工艺
ageing step 老化阶段
·2,447,543篇论文数据，部分数据来源于NoteExpress
The reforms have been welcomed by the Association of British Insurers (ABI) as "another positive step forward in tackling the challenges of an ageing society".
BBC: Social care: Inheritance tax freeze expected
Given that uncertainty, and the spectre of an ageing population, it seems a sensible first step to save any surpluses.
ECONOMIST: Alas, a bigger surplus doesn��t bring better policies
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