The distribution is the phase reverse between the high-latitude and the low-latitude district, which is the most distinctly structure characteristic of the sea level pressure in the north hemisphere.
北半球海平面气压典型空间分布结构中最显著的特点是高纬地区与中纬地区呈现典型相反的位相变化。
Fully automated control system, high and low pressure protection, power off phase and reverse phase protection, effective protection of compressor.
全自动化控制系统，高低压压力保护，电源断相及逆相保护，有效保障压缩机运行。
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