Applying data structure of dual cycle linked list, the problems of snapping points and snapping lines are solved, and some procedures, such as drawing pipeline section, inputting notes, deleting pipeline section, stopping pipeline section, changing flow direction and color of pipeline section are realized.

The time between the send pulse and the back pulse can be captured using the capture function of the PIC16C63.

This separable manipulator can capture, fix and drag underwater objects reliably by simple mechanical structures.

Innovative Education is ready to capture the good resources and made the learners have knowledge of what has learned, and understands how our predecessors solve the specific problems, and then simulates the solutions to the problem.

Besides perfect mastery of proficient skills and tactics, they must have keen insight and be able to catch the best time.

The article recommend that the wild Little civets was catched time and place and methods; and putted forward technology of the casue-genus and domestication of Little civets.

By example we can know how to use Sniffer pro to catch and analyze data message,and know the IP address which has the virus.

Two key techniques of snapping points and snapping lines are settled as a result of data structure of doubly linked list.

During edit process of spatial data, geometry object snap is an important function that must be implemented at high performance of fast echo speed.