It has been a difficult problem for technical personnel to estimate the yarn consumption ratio in the technological design of jacquard fabric.
提花织物工艺设计中的用纱比确定一直是摆在技术人员面前的一道难题。
Separation of Cu, Zn and sulphur has been a difficult problem for a long time.
铜锌硫多金属矿石分离历来是选矿界的难题。
How to keep on talent has been a difficult problem of state enterprise human resources management.
如何留住人才成为国企人力资源管理中的一大难题。
Separation of copper, zinc and sulphur complex ore has been a difficult problem in the mineral processing field.
前言：铜锌硫多金属矿石分离一直是选矿界的难题。
The treatment of waste gas with lead from the molten-lead pat has been a difficult problem. A Practical and economic treatment method is introduced in this paper.
熔铅锅产生的含铅废气的治理一直是没有得到解决的难题．本文介绍了一种切实可行、经济有效的治理措施。
The carrier magnetic disturbance which make magnetic deviation of the navigation equipment and influence geomagnetic measurement precision has been a difficult problem at all times.
载体磁场对地磁测量的干扰，一直是造成导航设备罗差、影响地磁测量精度的技术难题。
The carrier magnetic disturbance which make magnetic deviation of the navigation equipment and influence geomagnetic measurement precision has been a difficult problem at all times.
载体磁场对地磁场的干扰，一直是影响导航罗差、地磁测量的技术难题。
Due to the differences between Chinese and English culture and the differences between Chinese words and English words, the translation of the allusions has been a difficult problem.
由于汉英文化差异及词义差别，典故成语的翻译一直是翻译实践中的一个难点。
The interference of carrier magnetic field to geomagnetic field has been a difficult problem for a long time, which has influence on navigation compass deviation and geomagnetic measurement.
载体磁场对地磁场的干扰，一直是影响导航罗差、地磁测量的技术难题。
The interference of carrier magnetic field to geomagnetic field has been a difficult problem for a long time, which has influence on navigation compass deviation and geomagnetic measurement.
载体磁场对地磁测量的干扰，一直是造成导航设备罗差、影响地磁测量精度的技术难题。
The interference of carrier magnetic field to geomagnetic field has been a difficult problem for a long time, which has influence on navigation compass deviation and geomagnetic measurement.
载体磁场对地磁测量的干扰，一直是造成导航设备罗差、影响地磁测量精度的技术难题。
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