The paper discusses and analyses several problems existed in the project design.
结合工程设计实际，就几个方面的问题进行了分析和讨论。
All the above features and components can solve several problems existed in the traditional teaching team.
这些特性和要素能够很好地解决传统教学团队存在的种种问题。
Several key problems existed in field operation of liquid propellant are solved and field experiment results are given also.
解决了液体药现场施工过程中的几个关键问题，并给出了现场试验效果。
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