44、urge () to do sth

226、 the process has no print heads that move or print hammers that fire, the result is high speed and quiet operation.

225、The numeric keypad includes the mathematical keys found on a calculator.

224、They can be used for common commands such as “Print” or “Quit Program”.

223、Radio frequency

222、Transmission media

221、Physical layer

220、Wide area network

219、Store-and-forward

218、Computer aided design

217、Search engine