The plug-in version is composed of four segments (thee integers and a string) respectively named major.minor.service.qualifier (see Resources for the Eclipse Plug-in Versioning guide).
An enlarged pipe at the top of a casing string that serves as a funnel to guide drilling tools into the top of a well.
套管柱顶部的一根大口径管，形如漏斗，以引导钻井工具进入到井眼的顶部。
3
The width of elements and the spacing between neighboring elements in the whole handwritten Chinese character string are analyzed to guide the merging of left right elements.