opening velocity ==> 开离速度(电気接点) opening-to-application ratio ==> 就业职位求供比率,就业职位求供比率 openings for connections to brazed vessels ==> 用于对钎焊容器的连接开孔 ..
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opening to application ratio 就业职位求供比率
job opening-to-application ratio 职位供求比率
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