监测值是瞬时浓度值，测次愈少代表性愈差。
Thus, the monitoring values obtatined can only represent the instantaneous concentration of pollutant.
交流采样是按一定规律对被测信号的瞬时值进行采样，再用一定的数值算法求得被测量的值。
The AC sampling is carried out testing the AC signal based on the certain regulation, and desired the values of the AC signal based on the certain mathematical method.
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