久久久久久久久久久久久久久,国产一级 片内射毛片中出i,污污污网站免费观看视频,性一交一乱一乱一视频,一级a一级a国产爰片免费免免

 

到20世(shi)紀(ji)80年(nian)代末，主(zhu)要的(de)發(fa)(fa)(fa)電(dian)(dian)(dian)(dian)形(xing)(xing)式(shi)是水力(li)(li)發(fa)(fa)(fa)電(dian)(dian)(dian)(dian)、火力(li)(li)發(fa)(fa)(fa)電(dian)(dian)(dian)(dian)和核(he)能發(fa)(fa)(fa)電(dian)(dian)(dian)(dian)。其(qi)他能源發(fa)(fa)(fa)電(dian)(dian)(dian)(dian)形(xing)(xing)式(shi)雖然有多種,但(dan)規模都不大。3種主(zhu)要形(xing)(xing)式(shi)所(suo)占(zhan)(zhan)(zhan)的(de)地位因各國能源資源的(de)構成不同而異。世(shi)界上(shang)(shang)以火力(li)(li)發(fa)(fa)(fa)電(dian)(dian)(dian)(dian)為主(zhu)，其(qi)發(fa)(fa)(fa)電(dian)(dian)(dian)(dian)量在總(zong)發(fa)(fa)(fa)電(dian)(dian)(dian)(dian)中所(suo)占(zhan)(zhan)(zhan)比(bi)重(zhong)為70%以上(shang)(shang)。日、德的(de)火電(dian)(dian)(dian)(dian)所(suo)占(zhan)(zhan)(zhan)比(bi)重(zhong)在60%以上(shang)(shang)。挪威、瑞(rui)典(dian)、瑞(rui)士、加拿(na)大等國則以水力(li)(li)發(fa)(fa)(fa)電(dian)(dian)(dian)(dian)為主(zhu)，其(qi)中挪威、瑞(rui)士的(de)水力(li)(li)發(fa)(fa)(fa)電(dian)(dian)(dian)(dian)量均占(zhan)(zhan)(zhan)總(zong)發(fa)(fa)(fa)電(dian)(dian)(dian)(dian)量的(de)90%左右，加拿(na)大超過70%，瑞(rui)典(dian)也(ye)超過60%。芬蘭和南斯拉夫則水電(dian)(dian)(dian)(dian)與火電(dian)(dian)(dian)(dian)各占(zhan)(zhan)(zhan)一半。法(fa)國以核(he)電(dian)(dian)(dian)(dian)為主(zhu)，其(qi)發(fa)(fa)(fa)電(dian)(dian)(dian)(dian)量占(zhan)(zhan)(zhan)總(zong)發(fa)(fa)(fa)電(dian)(dian)(dian)(dian)量的(de)70%以上(shang)(shang)。

中國的水力資源雖然豐富，但受經濟、技術等因素所限，水電只占總發電的20%左右。就全世界范圍而言,在1980～1986年間，火電所占比重由70.2%逐年下降至63.7%，水電所占比重由21.3%降至20.3%，而核電所占比重則逐年上升,由8.2%升至15.6%（見表）。這一趨勢反映出，隨著化石燃料的短缺，核能發電越來越受到重視。但由于受日本福島事件影響，從技術和安全考慮，中國并未繼續建設核能發電項目。
       發(fa)電動(dong)力(li)裝置按能源的種類(lei)分為火電動(dong)力(li)裝置、水電動(dong)力(li)裝置、核電動(dong)力(li)裝置及其(qi)他能源發(fa)電動(dong)力(li)裝置。火電動(dong)力(li)裝置由鍋爐、汽輪機和發電機（慣(guan)稱(cheng)三大主機）及其(qi)輔助裝置(zhi)組成。水電動力裝置(zhi)由水輪發電機組、調速器、油壓裝置及其他輔助(zhu)裝置組成。核(he)電動力裝置由核(he)反應(ying)堆、蒸(zheng)氣發生(sheng)器、汽輪發電機組及其他附屬設備組成。