抗真菌药物 A: Chloroquine B: Ciprofloxacin C: Rifampin D: Zidovudine E: Econazole nitrate

In leguminous plants leghemoglobin protects _____ activity. A: Nitrogenase B: Protiase C: Nitrate reductase D: Both A and B

One of the negative environmental impacts of a recently clear cut forested area would be A: an increase in the nitrate concentration B: an increase in the average topsoil depth C: decreased volume of runoff from rainfall D: decreased water temperature in local streams E: decrease landslide frequency