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微信扫一扫The experiment was conducted in square pans made of PVC with sides of 0.8m and a depth of 0.12m. The surface film material adopted in the experiment was a mixture of 16～18-octadecanols emulsified with sodium dodecy1 sulfate and POE cetyl-ether（Yin et al., 1996）. Before experimentation, 500g air-drie
