Whichthematicprogressionpatternhasbeenusedinthisparagraph? TheinventorofthediodevalvewasFleming.Hemadeuseofthefact,firstnoticedbyEdison,thatanelectriccurrentcouldbemadetoflowacrosstheemptyspacebetweenthehotfilamentofanelectriclampandanothermetalelectrodeplacedinsidetheevacuatedbulb.Thiseffectdependsuponthethermionicemissionofelectronsfromtheheatedmetalfilament. (W.P.Jolly,(1972).Electronics,p.61)
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- Whichthematicprogressionpatternhasbeenus...72).Electronics,p.61
- 生产资本循环的公式是 ( ) 。 A: G—W…P…W′—G′ B: P…W′—G′——W…P C: W′—G′——W…P…W′ D: W…P…W′—G′——W
- /ananas/latex/p/1972
- 产业资本循环的一般公式是() A: G—W…P…W’—G’; B: W…P…W’—G’—W; C: P…W’—G’—W…P; D: W’—G—W…P…W’;
- 生产资本的循环公式是( )。 A: W…P…W′—G′——W B: P…W′—G′·G——W…P C: W′—G′——W…P…W′ D: G—W…P…W′—G′