OBJECTIVE: to study the present status of market concentration of pharmaceutical industry, tendency of change and the factors that induce the change of market concentration in China.
前言：目的：探讨目前我国制药行业市场集中状况、变化趋势和导致市场集中状况发生变化的因素。
Combined with the present status of coal market and the situation of simple product of the coal enterprises, the paper analyzes the future developing trend of coal market.
紧密结合当前煤炭市场实际，针对煤炭产品单一的现状，分析了煤炭企业今后的发展趋势。
In this paper, the present application status of infrared passive-active alarm is generally described, and their market is analysed.
本文介绍了主、被动式红外报警器应用现状及其市场分析。
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