他们还说到B级表面，那是什么?。
据报道，这种方法能够实现A级表面精度。
这种方法的优点是没有废料、能取得A级表面精度。
The absence of scrap material and ability to achieve Class-A finish.
通过滚压刚化表面涂饰和高mor，得到的坚固、经济的耐火级产品。
A rolled, rigidized surface finish and high MOR give a tough, economic refractory grade product.
并给出了模型表面压力随声压级及频率变化的规律。
Regularities of pressure on surface with sound pressure level and frequency are also given.
它比级分三更顽强地保持在表面上。
It was apparently more tenaciously held to surface than fraction three.
与产品接触的不锈钢表面，抛光到4级。
Stainless steel surfaces in contact with the product, polished to grade 4.
实验室用表面材料可以接受的结果是不超过4个点出现3级状况。
Laboratory grade finishes shall result in no more than four Level 3 conditions.
实验室用表面材料可以接受的结果是不超过4个点出现3级状况。
Laboratory grade finishes shall result in no more than four Level 3 conditions.
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