Typically, there are agency cost hypothesis, information asymmetry hypotheses, tax hypotheses, maturity matching theory and floatationcost hypothesis.
具有代表性的债务期限理论有代理成本假说、信息不对称假说、税负假说、期限匹配假说和发行成本假说等。
2
Due to the use of amine collector, the double reverse floatation flow had overcome the shortage of heating in the routine floatation of phosphorus, and its drug cost was relatively low.