It can provide the base for noise control of pneumatic drill.

为气动凿岩机噪声治理提供了依据。

youdao

This paper is based the full analyse and research of noise source of pneumatic drill.

对气动凿岩机产生的噪声声源进行了全面的分析研究，介绍了各声源的特性及测试方法。

youdao

The invention of pneumatic drill.

风钻的发明。

youdao

The invention of pneumatic drill.

风钻的发明。

youdao