| 单词 | mark–space | 
| 释义 | > as lemmasmark–space   mark–space  n. attributive designating an electronic communication system in which information is conveyed by the intermittent presence and absence of a signal (see sense  19b). ΚΠ 1953    Electronics July 183/2  				Mark–Space Phototubes. 1958    P. E. K. Donaldson  et al.  Electronic Apparatus for Biol. Res. xv. 234  				The circuit performs oscillations with a mark–space ratio of approximately unity, the waveforms having the form of Figure 15.14. 1969    J. J. Sparkes Transistor Switching iii. 52  				A circuit capable of producing rectangular waves with very sharp rising and falling edges, at mark–space ratios of between 1:1 and 500:1,..is shown. 1992    RS Components: Electronic & Electr. Products July 1209/3  				A high performance function generator..having d.c. offset and variable mark–space facilities. < as lemmas  | 
	
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