选用13型压电复合材料作为研究对象，压电相为PZT5H，环氧树脂作为基体相。

Type 13 composite piezoelectric material is used as research object, which composed of PZT5H is piezoelectric component and epoxy.

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在一项由Leeville大学就Leeville市民阅读习惯所作的研究中，大多数受访对象称，他们偏爱将文学名著作为其阅读材料。

In a study of reading habits of Leeville citizens conducted by the University of Leeville, most respondents said they preferred literary classics as reading material.

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本文将灰膏类材料的加工工艺作为主要研究对象，探讨了灰膏基体材料和混合体系的性能与各自制作工艺之间的关系。

This paper takes processing technology of lime cream materials as the major study object, and explores relationship between production process and performance of basic lime cream and mixed system.

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