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About product and suppliers:
        Alibaba.com offers 46,546 us competence products. such as free samples, paid samples. 

There are 46,283 us competence suppliers, mainly located in Asia. The top supplying countries are China (Mainland), Hong Kong, and Vietnam, which supply 98%, 1%, and 1% of us competence respectively. 

Us competence products are most popular in Western Europe, Mid East, and North America. 

You can ensure product safety by selecting from certified suppliers, including 7,705 with Other, 4,695 with ISO9001, and 629 with ISO14001 certification.