... 操作管理员 an operation manager; 操作管塞 operating tube plug; 操作管套 operating tube shield; ...
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Application of some measures, such as semi-close unloading and increase of crane tube plug etc. can availably decrease oil gas concentration in operating area.
采用半封闭卸车、增加鹤管堵头等措施可有效降低作业空间的油气浓度；
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