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.
本文结合模型试验，得出了不同温升及变率下表面横向浮射流的瞬时浓度场和流速场，进而分析得出随着温度及变率的变化浓度场的扩散范围、形态特点和趋势。
Based on the model test, the instantaneous concentration and velocity images in different temperatures and scales are put forwarded. And the range, shape and trend of diffusion are acquired.
焊剂中较高的松香浓度明显有益于焊点的抗剪切蠕变强度，而对瞬时剪切强度影响不大。
It was also found that higher concentration of rosin in flux is beneficial for shear creep resistance of the joints, while its effect on the instantaneous shear strength is less obvious.
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