国家结构形式主要可以分为单一制国家和复合制国家。
The form of state's structure is divided into single state and multiple state.
介绍了一种复合相变蓄热器的工作原理和结构形式，提出了应用中所存在的问题。
A kind of composite phase change heat storage is introduced in this paper, including its working principles and structures.
介绍复合材料承力接头设计的相关理论及应用状况，包括设计基础、结构形式、强度分析、相关试验等。
The related theory and application of bearing - load composite joints are briefly reviewed, including design basis. structure. strength analysis. related testing and so on.
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