In science, every path should be taken. Finding a dead end is a great contribution to science—— Einstein
Guangzhou Chengna Chemical Industry CO., Ltd
- Address：Room A308 Hongbao Building, No.16 South Road Daguan, Tianhe District , Guangzhou City, Guangdong Province, China
- Phone：+86 020-82010635
- Q Q：381134019
- E-mail：zhongyanlong168@126.com
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