By comparing SG changes of both frozen tissue samples and fresh samples it is to determine the sampling methods' effect on measurement of specific gravity of tissue.
通过比较冷冻后采样和低温直接采样脑组织比重的变化，比较采样方法对于测量结果的影响。
By comparing SG changes of both frozen tissue samples and fresh samples it is to determine the sampling methods' effect on measurement of specific gravity of tissue.
通过比较冷冻后采样和低温直接采样脑组织比重的变化，比较采样方法对于测量结果的影响。
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