Ink-jet printer belongs to nonimpact printers in which the characters are formed by projecting particles or droplets of ink on t

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问题 Ink-jet printer belongs to nonimpact printers in which the characters are formed by projecting particles or droplets of ink on to paper.(71) printer is also a nonimpact printer in which the characters are produced by applying hot elements to heat-sensitive paper directly or by melting ink from a(72) on to plain paper. Electrostatic printer creates an electrostatic latent image, which is then made visible by a toner and transferred and fixed on paper. An electrostatic printer may be used in some instances as a(73). Laser printer creates, by means of a laser beam directed on a(74) surface, a latent image which is then made visible by a toner and transferred and fixed on paper. Magnetographic printer creates, by means of magnetic heads operating on a metallic drum, a latent image which is then made visible by a toner and transferred and fixed on paper. Computer-output-microfilm (COM) printer produces on a photographic film a(75) of each page.

选项 A、microimage
B、holograph
C、thumbnail
D、bitmap

答案A

解析 可靠性是指在给定条件下和给定时间内,某一功能单元履行所需功能的能力。耐久性是指在给定的使用条件和维护条件下,某一功能单元履行所需功能直至达到某一极限状态的能力。可维护性定义为当维护是在给定条件下,采用例行规程和资源进行时,给定使用条件下某一功能单元维持在或恢复到能履行所需功能的能力。可用性规定为假定提供所需外部资源,在给定的瞬时或时段和给定的条件之下,某一功能单元处于履行所需功能状态的能力。在外部资源(不同于维护资源)不影响该功能单元的可用性时,此处所定义的可用性是一种固有的可用性。
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