酸酐;N.A酸酐;NA;Endomethylene tetrahydrophthalic anhydride 开环DNA;松环DNA;open circular DNA;open circle DNA;relaxedcircular DNA;ocDNA 回折DNA;foldback DNA ..
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具有护树木效果好又无须经常松环的的特点。
The invention has the characteristic of good protection effect for trees without the need of loosing ring frequently.
如果阀门用在高速流体(湍流)或热循环应用环境中，则螺纹阀座环应该锁焊到阀体上，避免松落。请在订购时加以指定说明。
Threaded seat rings for valves in services with high velocity turbulent flow or thermal cycling should be lock welded to the body to avoid loosening. Please specify.
固定方法有：前环骨折采用钢板固定；后环骨折分离采用骶骨棒，四孔方形钢板，松质骨螺钉固定。
The methods include posterior ring internal fixation by using sacral bars, four-hole square plates or cancellous screws with anterior ring fixed by plates.
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