To study the characteristic of sleep spontaneous electric activity of the brain at high altitude.
目的：探讨移居高原青年睡眠自主脑电活动的特点；
The second part, understand: the classification and cultural characteristic of school conventional activity ceremony.
第二部门，理解：学校常规活动典礼的分类与文化特色。
Is the humanity information conversion activity important characteristic;
是人类信息变换活动的重要特征；
The catalyst has high activity, selectivity and the characteristic of reaction controlled phase transfer catalyst.
该催化剂具有高活性、高选择性，且具有反应控制相转移催化剂的特性。
What are characteristic of activity when target consumers use this type of product?
目标消费群对这类产品的消费特点是什么？
What are characteristic of activity when target consumers use this type of product?
目标消费群对这类产品的消费特点是什么？
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