本文通过对比试验，对湿排粉煤灰在墙体材料中的应用进行了研究。
The application of wet discharged fly ash in wall material were studied by compared the experiment.
本文通过对比试验分析了两种管长在不同转速下噪声频谱图，其共振转速与计算结果比较吻合。
The analysis of noise spectra of two exhaust pipes at different engine speeds is made. the resonance speed is obtained and agrees with the calculating value.
本文通过田间与盆栽对比试验及室内分析相结合的方法，研究了大豆连作胁迫下锰营养的变化特征。
The kinetic characters of Mn nutrition stress caused by continuous cropping soybean were investigated by pot experiment, field experiments and chemical analysis.
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