Commercial activity area的意思|示意

美 / / 英 / /

商业活动区

商务活动区 ... 电子服务区Electronic service area 接待休闲区Reception leisure area 商务活动区Commercial activity area ...

In this paper, the chemical activity of commercial fly ashes with different type taking from Shanghai area are researched and compared.

对上海地区多种商品粉煤灰的化学活性作了研究与比较。