This paper discuses some problems of reliability about ZX 7 direct current inverse electic welding machine.
讨论了ZX7直流逆变焊机的几个可靠性问题,实验结果证实了方案的有效性.
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The meetings will bring together electic elected leaders , business owners, students, parents and education officials.
这些会议联合了当选的领导人,企业主, 学生, 家长以及教育工作者.
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