In accordance with the accidents of relay protect because of mistake in design about distant-tripping input circuit of optic-fibre differential protection,to prevent the similar accident s occurrence,it is necessary to put anti-fault measures about RCS-931 distant-tripping input circuit of optic-fibre differential protection into effect.

Exploration of improving accuracy of running in long-jump;

The correlation analysis on the results of 100-meter dash and long-jump;

Training method of the long-jump through improving the run-up footboard technology;

Study the law physical fitness transfer of long jump and high jump;

Studies on the rhythm and accuracy of approach-running ofjunior long jumpers by mark with sponge brick;

A tentative analysis on psychological factors of affecting the accuracy of stepping on the footboard in long jump;

The light-conducting fibres longitudinal differential protection should remote breaking when bus protector acting;

With investigating and analyzing the 10th nation games 37 jump players′approach.

By the methods of documents,statistic and analysis,the paper made an analysis and comparison for relevant parameter of the take-off phase of the elite mail long jumpers between China and those abroad.

Through practical test, this paper makes an exploratoin into the relation between the results and the coefficient of speed utilization in run-up process in running jump.

Analysis on Broad Jump s Approach Run Speed and Take-off Technique Scoring Performance;

Analysis of factors influencing the accuracy of run-up in broad jump;

The relationship between run-up and take-off in broad jump is analysed through thesimple principles of mechanies.