结合设计实践，提出了亚声速离心叶轮CAD研究中应重点解决的若干理论问题。
In this paper, connected with centrifugal impeller design, authors proposes some theory problems to he investigated in CAD research of subsonic centrifugal impellers.
介绍了无保护流体室温磷光的命名过程，研究进展和研究中碰到的若干理论问题。
In this paper the named process, progress of study and the several theory problems encountered in research on non-protected room temperature phosphorescence are described.
拟从涉外侵权法律行为的法律选择规范着手，对最密切联系原则的若干理论问题进行探讨。
Analyzes several issues of the theory of proximate connection from the perspective of international civil tort rules of choice of law.
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