一些文献就不同结构的钻头各有何种横向刮凿作用的问题提出的答案，既不能准确定量，在定性概念上也有严重缺点。

Some papers have put forward the lateral scraping action results of the roller bits, which are quantitatively inaccurate and qualitatively defective.

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本厂主要产品有：各种起钉器、凿、锉、园艺工具、电瓶夹、铲、冲击钻头、撬棍、千斤顶支架、雕刻刀等。

The main product we have is: all kinds of wrecking bar big file and rasp garden tool battery terminal various bolsters pound at the avger pry the stich jack engraving knife etc.

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