通过实验研究了一体化自然循环反应堆压力壳上部自稳压气空间对于自然循环两相流系统启动过程中流动稳定性的影响。
The influence of the gas space on the top of an integral reactor vessel on the flow stability in the start up process of a natural circulation two phase flow system is studied experimentally.
在城市化和再城市化过程中，应大幅度减小中心城区自然地理系统所承受的高强度人类活动压力。
The pressure of human activities to the physical geographical system in central urban area must be reduced during urbanization or re-urbanization.
在城市化和再城市化过程中，应大幅度减小中心城区自然地理系统所承受的高强度人类活动压力。
The pressure of human activities to the physical geographical system in central urban area must be reduced during urbanization or re-urbanization.
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