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 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。
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。
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