方法：对33例常规脑电图（ EEG）正常或无特异性改变的患儿进行了蝶骨电极加过度换气试验（HV）描记后出现痫样放电的病例进行分析。
Methods: Sphenoidal electrodes and HV were done and the epileptiform discharges recording were analysed in 33 children who with normal or non-specific change EEG.
试验表明有每小时只有0.6空气的变化，而许多老房子都可以每小时几换气。
The test showed there are only 0.6 air changes per hour, while many older homes can have several air changes per hour.
研究试验结果表明，分层扫气可减少换气过程的燃料损失，使燃油消耗率大幅度下降； 使混合气空燃比的范围加大。
The result shows that stratified scavenging reduces fuel loss during air exchange greatly lowing the fuel consumption rate and enlarging the air-fuel ratio range.
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