裙子相连接成的连体服装样式。款式种类繁多，有长袖的、短袖的，有领式的和无领式的各种式样变化。
The skirt are connected into one-piece dress. A wide range of styles, with long sleeves, short sleeves, a collar and no collar style pattern changes.
无接箍式套管靠管体两端的螺纹连接，所以套管外径尺寸小，可增大环形间隙，便于套管下入和提高固井质量。
It connects with threads on both ends of pipe body, which allows a smaller casing O. D. and increases annular gap to facility casing running in and improve cementing quality.
无接箍式套管靠管体两端的螺纹连接，所以套管外径尺寸小，可增大环形间隙，便于套管下入和提高固井质量。
It connects with threads on both ends of pipe body, which allows a smaller casing O. D. and increases annular gap to facility casing running in and improve cementing quality.
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