| | | | | 90% | | | | | | | | | | | | | | | | | | 160 | | | | | | | | | | | | | | | | | | 0.4mg/L | 5~10mg/L | 15 | 20mg/L 15 50% | | 0.1mg/L | | | | 0.2~0.3mg/L | | 0.4mg/L 20 | | | | | | | | | | | | | | | | | | | | | | | | | 2 | 5g | 10g | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |