brown stock是什么意思

用法例句

The results indicate that yield of screened pulp is almost unaltered, brightness of unbleached pulp is improved 8.

0%,在温度90℃时处理30min可以得到满意的结果,在纸浆得率几乎不变的前提下,烧碱蒽醌法蒸煮未漂浆白度提高了8。