ICRP Human Respiratory Tract Model and the relative toxicity potency of PAHs reported by WHO were used to compare the unit risk value for lung cancer of the different fuel and the PAHs depositions on human respiratory tract in different aerodynamic size were estimated. 利用肺沉积模型和WHO/ICRP公布的多环芳烃相对毒性值比较了不同燃料燃烧产生的多环芳烃对人体的致肺癌危险度和不同粒径颗粒物上多环芳烃在人体呼吸系统的沉积量。
The exchange rate risk that the construction unit of the highway faces is shown as the trade risk ma in ly. The risk is the change of the receivable assets ' and the payable debts ' value. 公路建设单位面临的汇率风险主要表现为交易风险,即由于外汇率波动而引起的应收资产与应付债务价值变化的风险。