A string of incidents related to Soyuz has raised concerns. Problems during a landing in April 2008 resulted in a dangerously steep re-entry trajectory.
联盟号飞船发生的一系列事故也让人感到担心。2008年四月着陆期间发生的问题导致它出现重返地球时的险情。
The landing is thread connected with stop ring and tightened on and put into downhole with drill string. The landing sub is used as a sub above drill string before check valve is run in downhole.
就位接头与止动环用螺纹联结并上紧扣和钻柱连接下入井内，在未投入止回阀时作为钻柱上的一个接头。
The landing is thread connected with stop ring and tightened on and put into downhole with drill string. The landing sub is used as a sub above drill string before check valve is run in downhole.
就位接头与止动环用螺纹联结并上紧扣和钻柱连接下入井内，在未投入止回阀时作为钻柱上的一个接头。
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