By experiment, for the effect of fan expending Angle to noise and efficiency study.
通过实验研究离心风机蜗壳扩张角对风机噪声及效率的影响。
Experiment results showed that the method is worth while for further study.
试验结果表明，该方法值得进一步研究。
After the experiment and study for two years, finally, the essay is formed.
经过近两年的实验研究，最终形成了该论文。
After the experiment and study for two years, finally, the essay is formed.
经过近两年的实验研究，最终形成了该论文。
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