目的建立大鼠c6脑胶质瘤模型，行一般观察和MRI检查以确定颅内肿瘤生长情况，寻找简易判定颅内肿瘤大小的可靠指标。

AIM to establish a rat C6 brain tumor model, observe the tumor growth by general observation and MRI scan and seek for a simple and reliable index to judge its size.

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对一般进口货物原产地的判定，通常是根据进口商的申报。

The judgment of the origin of ordinary imported goods is usually based on the declaration by importers.

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本文通过引入证券价格，讨论一般证券集组合前沿的分类，并据此直接证明判定某个证券子集是全集的有效子集的一个充要条件。

Introducing prices of securities, this paper classifies general securities sets by portfolio frontier and then a direct proof for a determinant theorem about Efficient Subset is obained.

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