UL - 維基百科，自由的百科全書 Underwriters Laboratories Inc. ( UL) 是一家獨立的產品安全認證機構，於 1894 年成立，總公司在美國的伊利諾州 ...
UL (safety organization) - Wikipedia, the free encyclopedia UL (Underwriters Laboratories) is an American worldwide safety consulting and certification company head ...
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