Objective To acquire relevant parameter of normal fetal cardiac structure and function.
目的为获得正常胎儿心脏结构及其心功能的相关参数。
The paper points out the design index, sets up mathematical model and optimizes the relevant parameter with reference to the feature of the ranging mechanism.
本文针对调高机构的特点，提出设计指标，建立数学模型，优选有关参数。
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