取2支试管,1号试管加2ml稀释的浆糊、2ml唾液,2号试管加2ml稀释的浆糊、2ml的清水,分别向两支试管中各滴加
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取2支试管,1号试管加2ml稀释的浆糊、2ml唾液,2号试管加2ml稀释的浆糊、2ml的清水,分别向两支试管中各滴加取2支试管,1号试管加2ml稀释的浆糊、2ml唾液,2号试管加2ml稀释的浆糊、2m
取2支试管,1号试管加2ml稀释的浆糊、2ml唾液,2号试管加2ml稀释的浆糊、2ml的清水,分别向两支试管中各滴加
取2支试管,1号试管加2ml稀释的浆糊、2ml唾液,2号试管加2ml稀释的浆糊、2ml的清水,分别向两支试管中各滴加
取2支试管,1号试管加2ml稀释的浆糊、2ml唾液,2号试管加2ml稀释的浆糊、2ml的清水,分别向两支试管中各滴加
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