| | | | | | | | | | | | | | | | | | | | | | 1. | 1 14 | | | | 1 | 2 | | | | 3 | | | 4 | 250mg\L_ 500mg\L | | 5 | | | 6 | | | 7 2 | | | | 2. | 1 | | 2 | | 3 | | 4 2 | | 3. | | | | | | | 1. | | 1)—(6) | 2. | 1)—(3) | 3. | | | | | | | 4. | | | | | | | | 1. | (1) 14 | | | 2 | | 3 | | | 2. | (1) | 500 | | | (2) | | | | (3) | | | (4) 250mg\L_ 500mg\L | | (5) | | | (6) | | (7) | | | 3. | | | | | 4. | | | | | | | | | | | 2020 2 10 | |