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.
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。
2
Thus, the monitoring values obtatined can only represent the instantaneousconcentration of pollutant.
监测值是瞬时浓度值，测次愈少代表性愈差。
3
Based on the model test, the instantaneousconcentration and velocity images in different temperatures and scales are put forwarded. And the range, shape and trend of diffusion are acquired.