Total import and export volume grew by an average annual rate of 15.9%, and the structure of imports and exports constantly improved.
进出口总额年均增长15.9%，结构不断优化。
The function of control file is to define the data relationship between import and export, the structure of import data and the report, the right and the character of users etc.
控制文件的作用就是定义输入输出数据间的关系，输入数据及报表的结构、用户的权限及性质等。
Comparing import and export, we find that export plays larger driving role than import, namely, export is more beneficial than import to optimize Heilongjiang industrial structure.
从进口和出口的比较看，出口对各产业的拉动作用要大于进口，说明鼓励出口比促进进口更有利于黑龙江省产业结构的优化调整。
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