The current situation and characteristic of the quality of arable land is analyzed, the relationship between the constructions of arable land with the development of sustainable agriculture is discussed, and the countermeasure of fertilizer and the comprehensive conservation of soil are put forward.

This paper expounds the main ways for performing the educational function by university library from developing the ideological and political education, professional education, comprehensive education and information literacy education.

Correct understanding of the comprehensive educational idea can make music education practise tantalization well.

In view of these situations,a study on Synthetical Preservation Technology of Razor Clams(Sinonovaculla Constricta(Lamark)) was done in this paper.

The paper introduced the principle of structure of a kind of integrated protection system for underground high-voltage switchboard and its main functions,expounded design of hardware and software of the system.

The working principle and design methods of hardware and software of an integrated protection device for low-voltage flameproof motor based on STC89C58RD~+ single-chip microcomputer were(introduced) in the paper.

The authors propose that the new integrated protection should be set properly considering reasonable starting current and starting time, at the same time, the second stage positive sequence current protection should be set considering maximu.

A Motor Comprehensive Protection System Based on CAN Bus;

Application of microcomputer algorithm for mine motor comprehensive protection;

Study on the Comprehensive Protection of the Drive System of Induction Motor and the Thyristor;

This paper describes the connotation of invest-product of the weapon comprehensive support, analysis the problem for the present and the fact of CEA (cost-effectiveness analysis) of the weapon s support, and put forwad the basic practical model of the invest-product of the weapon s comprehensive support.