(2/2)ҳ
2000ֵͻȻԵС
ҫ˵ķӦаЦҪģʵη2ּھ˵һδ̫ƽ纣Ȩġս
ս1880-1900֮䱬ʲôɻĸܳΪԵʷϵĵһսһսноԵļֵʷϵ¹յսаӢӴǿ϶Ӯʤ¹˷Ҳп١Сӡ͡ðӡ
λ̫ƽʮһսнָصصںͼϣԼδ֧ӾҲҪ
ǣ
˵ӦУҫζؿ֣һۡ
֣صϽ콢źվҡú͵ƱصڻƵĹԵø
̫ƽҪ1.5ֵսн֣ѹüָͣʶô棬ӦòֹһңǼƻʮڽɶҡ
ɽȨIJ豭ǡһϣңĹҵǸֲľҪ.
ݸѾܹ²֣ұɫ쵼ݸѧԺרڿԴֵָʽ¯Ŵӻͳһ鱨ҴӼձѧġܿҪȥѧϰ֣ͬļڵ
ųȥҪɡԼˣ
֣üʡձĹʵûа취̫ƽ.
ǾһҸģͻȻİ𣬡ǿһˮ2.5֣װ˫װ300
ɽһҪԤ㣿ھ.
һҵǮеģҧһң
ľͭ࣬ڻص
ӹָܺ
ҫָļϵݣ1.5սҪ200002000Ļ鶼
ҪӢ˵ļͻȻϣݵָͼ֣䣬ϵֵĴ˵ҪһҸĽ͡ʿϣDzĹʦȥִѧϰ졮ʿļ
ľüʽ
ʲѺȥɡЦԼ̶ӼӴѻƬóף
ѻƬһ㶣սѾѻƬ.
һЦ䲻˵.
ͻȻ̧ͷֱ˲š˵˹촬ڲԱ.
͵룬ҪھŶӣߴñ˼ƻǶҩɭ˹˾Ĺʦ
Ӣ10š
Ӣ⽻15±Ȳ̶ְָںڰ£յפʹݵܱǶһʿϣDzʦѧϰʿĽ켼
˹ЦʿѾˣǡкôձλ.dzؼ
˹˵ͷӢҪһԼ
ǩĶ