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摆线针轮减速器
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摆线针轮减速器
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通用齿轮减速器
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cycloidal pin-wheel reducer
摆线针轮减速器
由外齿轮齿廓为变态摆线、内齿轮轮齿为圆销的一对内啮合齿轮和输出机构所组成的行星齿轮传动装置。
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public relations crisis management
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public relations functional school
public relations in colleges and universities
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public relations practitioner、 PR men、PR officer
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Public Relations: Strategies and Tactics
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