针对链条炉排锅炉固定式炉拱结构在运行中存在的诸多缺陷，研制出活动炉拱。
In view of the drawbacks of the chain boiler fixed arch in operation, has been developed the moving arch.
双跨固定式液压升降平台结构稳固、故障率低、运行可靠、安全高效、维护简单方便。
Thee double cross fixed hydraulic lifting platform has the advantages of stable structure, low failure rate, reliable operation, high safety, high efficiency, simple and convenient maintenance.
本文介绍了固定式铜串宫内节育器的结构及放置技术，总结术后随访的资料。
Thisarticle introduces the structure and deposited technique of IVD, summarizes the follow -up data.
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