英语词汇“british association thread”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	british association thread
释义	british association thread noun Usage: usually capitalized B&A : a screw thread with an angle of 47 1/2° and rounded crests and roots that is used chiefly in Great Britain and other European countries for very small screws
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