Positive mechanical thrust drives plug into body seats to ensure tight bi-directional line seal.
积极的机械推力驱动阀塞进入阀体阀座馁，确保紧密双向管路密封。
Arrange personnel on manual excavation line rather than taking mechanical excavation.
在人工开挖路线上，安排人员进行开挖，不得机械开挖。
Mechanical design, automation, mechanical and electrical integration, production line design.
机械设计，自动化、机电一体化、生产线设计。
Mechanical design, automation, mechanical and electrical integration, production line design.
机械设计，自动化、机电一体化、生产线设计。
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