On the research and design of deep web crawler;

Design of A Multi-strategy Topic Specific Web Crawler;

The paper proposes a concept space-based subject crawler structure, which is used to a rapid,effective subject information search robot system.

Network Robot Spider is an important component of the search engine it , it determines the quality of content of the entire search engine system,determines if the pages can be updated in time.

Therefore,according to different insect distribution patterns,whole storehouse circulation fumigation,applying the pesticides at the top,upper and bottom of grain mass,or local fumigation can be choosed to effectively control the insects.