分别对开口有背压活塞环和整体无背压活塞环的工作原理和结构作了阐述。
The work principle and structures of backpressure piston rings and integral non-backpressure piston rings were expounded.
每根主轴都与料管内的无芯螺旋连接，料管中段上部开口，开口上设料斗，料斗内设搅料装置。
Each shaft is connected to screw without core in material pipe, there is opening in middle section of material pipe, there is hopper on opening, and there is agitating device in hopper.
终端开口与转动风扇的比较表明，无隔道进气道的后向散射主要来源于外罩唇口的电磁波散射。
The comparison results of the bump inlet with opening terminal and with rotating fan at the outlet indicate that the electromagnetic scattering comes mostly from the mouth of inlet.
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