Supervisory and senior positions in this unit group require experience.
本单元组的主管和高级职位要求具有经验。
With experience, mechanics and technicians in this unit group may progress to supervisory positions.
随着经验的积累，本单元组机械师和技术人员可能晋升到主管职位。
In order to improve the coal mine ventilator supervisory and monitoring system, the intelligent unit of sensor is designed based on AT89C52.
为了改进煤矿风机监测系统，设计了基于AT 89c52的传感器智能转换单元。
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