Lastly, the measurements of the cigarette filter ventilation and pressure drop were taken using a KC3 combined dilution/pressure drop instrument (Borgwaldt-KC, Richmond, Virginia, USA).
最后，采用结合稀释/压力差仪器（美国弗吉尼亚时士满Borgwaldt-KC）的KC3进行香烟过滤器和压力差的测量。
The both methods enjoy advantages of higher production capacity, lower development ratio, less dilution loss and better ventilation.
两种方法均具有生产能力高，采掘比低，贫化损失较小，改善通风条件等优点。
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