Some existent problems about construction management of concrete in winter are explored in this paper.
探讨了冬期混凝土施工管理所存在的问题，并提出相应的解决办法。
The principal, component and performance of this kind of sensors are demonstrated, also some existent problems and the research direction in future are discussed.
对其原理、组成和性能进行了评述，并讨论了一些存在的问题和今后的研究方向。
Then with position quotient law, each department structure of 9 biggest cities has been carried out preliminary analysis, and has been revealed some existent problems.
并运用区位熵法对9个最大城市的部门结构进行了初步分析，揭示了其中存在的一些问题，最后运用统计分析方法对各城市主导产业进行了分级。
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