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人民币汇率网提供今日美元、欧元、日元、港币、英镑等世界各国数百种主要货币兑换的汇率换算工具,和外汇牌价查询服务、实时换算汇率表走势等外汇即时资讯。

Chemicalbook is a platform dedicated to provide the most valuable resources for chemical industry users. Here you can get chemical information (such as chemical physical properties, safety data, Excellent china suppliers and their web addresses and etc.)by searching the name, CAS number, molecular formula, molecular weight, MDL number, EINECS number, structure.