正常情况下，NMDA受体活性较低从而保证神经细胞不会出现钙超载。
Under normal conditions, the activity of the NMDA receptors is tightly regulated to prevent nerve cells from becoming overloaded with calcium.
同时还应从道路养护、制止超载等人的因素进行管理，综合治理，保障道路的正常运营。
Meanwhile, it should be managed from the people factors of road maintenance and overfreight inhibiting. It can ensure the road running in normal by comprehensive controls.
超载，交流输入不正常，低电池，故障。
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