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单词 type drum
释义 type drum
[`tīp ´drǝm]
COMPUTER SCIENCE
A steel cylinder containing 128 to 144 lateral bands, each band containing the alphabet, the digits 0-9, and the standard set of punctuation marks such as commas and periods, and revolving at high speed; printing is achieved by a hammer facing each band and activated at the right time to cause a character to be printed on the paper flowing between hammers and drum.
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