Since a pentode presents a fairly constant current sink , trying to power it from a constant current source will be fairly unsuccessful , sort of like the unstoppable object hitting the immovable object 因?yàn)槲寮?jí)管本身就表現(xiàn)得類(lèi)似恒流陷阱(意思是消耗恒定的電流) ,試圖用恒流源驅(qū)動(dòng)五級(jí)管只會(huì)是個(gè)失敗,就好像試圖用一個(gè)停不下來(lái)的物體去打擊一個(gè)不可移動(dòng)的物體。
The paper reviews the three pentodes about urban e - government research , narrates the research progress of service functions , sustainable ability , spatial distribution and models , development motives and key functions on urban e - government functionality from the view of home scholars 摘要回顧國(guó)內(nèi)城市電子政務(wù)研究的三個(gè)時(shí)期,評(píng)述國(guó)內(nèi)學(xué)者對(duì)我國(guó)城市電子政務(wù)的服務(wù)職能,可持續(xù)發(fā)展能力,空間格局影響,模型,發(fā)展動(dòng)力與核心功能5個(gè)方面的研究進(jìn)展。