本文根据流体动量理论导出了阀芯关闭过程中液动力的关系式，在此基础上建立了二通插装阀阀芯关闭运动方程。
From fluid flow momentum theory the basic equation of flow dynamic forces in the spool closing process is derived, and the spool dynamic equation of the two-way cartridge valve is established.
常规7芯铠装测井电缆的传输特性并不适于高速传输井下视频数据。
The transmission characteristics of conventional 7-conductor armored logging cable is not good to transmit video data with high-speed.
包封面：在书芯(用铁丝平订，胶装或线装造成)的脊部加胶，贴上纸或纸板书皮的情况。
Wrappering: Attaching a paper or board cover by gluing at the spine of a book block which may be stabbed, adhesive bound or sewn.
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