分析了不同孔径空洞的木材试件的超声波功率谱。
Ultrasonic power spectrums of wood specimens, which have different size holes, are introduced in this paper.
实验结果表明：增加超声波功率，导致镀层硬度增大。
The experimental results show that the increase in ultrasonic power leads to the increase in hardness of the coating obtained.
探讨了不同提取剂，提取的剂用量、提取时间、次数及超声波功率对提取效果的影响。
The effects of different solvents, solvent amount, extraction time and times, and ultrasonic wave power were explored.
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