1·This paper analyses the characteristics, efficiency and harmonic of four kinds of power circuits for SCR-cascade control used in textile mill ventilators.
本文分析了目前纺织厂通风机可控硅串级调速四种主电路方案的特点、效率和谐波等情况。
2·The mechanisms of the noise generated in mine ventilation system, mainly in ventilators and electric motors, are analyzed in detail main measures and ways of noise controlling are put forward.
就矿井通风系统(主要针对通风机、电动机)噪声产生的机理进行了较深入的研究分析，并提出其噪声控制的主要措施与途径。
3·The experimental results show that the new valve functions to well in testing the rate of gas flow that it can be applied to the performance testing of ventilators.
试验结果表明，该调节门是一种较为理想的流量调节装置，完全适用于通风机性能测试。
4·No, hold ventilators not operational.
不，货舱通风机不能工作。
5·The Chambers are nicely lit and equipped with ventilators and air pumps.
墓室内照明很好，装备有通风机和气泵。