硼酸铅;
In this paper both lead borate sealing glasses and lead free phosphate sealing glasses are studied.
本文研究了含铅的硼酸盐封接玻璃和无铅磷酸盐封接玻璃。
简答网 · 高考英语
简答网 · 中考英语
简答网 · 四六级英语