We discuss from several angles: the development of semantic meanings, the change of the structure form, the function of cognitive psychology, the influence of using frequency, prag.

3-layer combination casing strength analysis and calculation;

Progress of combination photocatalytic oxidation in wastewater treatment;

A new injection profile combination logging tool and its application;

Resolving Problems of Permutations and Combinations with Generation Function;

Analysis on Applied Effects of Different Forage Combinations Used in Rabbit Production;

By crossing 8 hybrid rice sterile lines with 12 early hybrid rice restorer lines(cultivars) through incomplete diallel cross(NC Ⅱ)desig n,96 combinations of early hybrid rice were obtained.

Theoretic Mode and Positive Analysis of Technological Innovation Portfolio;

This paper presents the modern portfolio theory and related math model, modifies the benefit and risk function from oil production plant portfolio model: the net present value instead of yield rate is as the measurement of yield function; the absolute deviation instead of variance is as the measurement of risk function.

The modern investment portfolio theory and its evolvement model which are based on β value are introduced.

The influence to the diversion tunnel wall stability with joints composition of type Ⅱ-Ⅲ surrounding rock of the diversion tunnel of Baise multi-purpose dam project;

Research on the hight composition of narrowhigh type tail pipe;

Study on composition of Web service based on distributed awareness;