(1/2)ҳ
dzͰʱѾӽսҲһĻϵıͬʱһ㶡
Ȼ֪Ǹ׳ʲôʵܹѡҪôʵǺµçҪôĶԼʵš
Ǹںߡ
߲ţΪԼһܽޣԴס
һߣȻɱˣ
ĺ¹ͷϸܵĺ飺
ħôǿҼǵɵǷӥװɣ
dzĻҲǶξ顣
ԣǷӥ.
ĻǷԽܣϾֵһԣǷӥ
ӥ϶˵ǶΪٻˣ϶˵ǿ
ػȻһֱ٩һӻǶӣػıûв
ȷʵġ
ӥħʵ֪£һߣȻֱɱ
˶һۣӶԷж
ھеıûôǿ
֮ʣһɫӰͻȻȺгһcosɡȮҹ桱ɱľķУԥնħޡ
֮ˣ
ߺʽľϵķ˲䱩ǣħļһۣˮÿһնƿХЯżµ
ӱϿѹסħޡ
ʵϣЩĹûжħʵ˺
ħڱжһʱҲԷ
ܿı˲ԣĿͻȻϺɫ˿ߣֶȥ
Сģ
̲סͬʱҲЩɻħҲ˿
Ȼ˵ϻ˿ھкûչֹ³ĶǼš
ţ⣿
ⲻ˿߰ɣɫҲ
ڰŵʱҲעһϺɫ˿ߣμת֮յرܿ˿İΧ
˫һʱ˽֡
ҲڴʱȺһźۡߵӰüܣƺԼͻȻе
ǵɨħޣԼǸħսʱǾ
ʿǣĵӺħս
ңٿط.
ľӰĺˣ
ûбʸȴ
벻𰸵ҡҡͷȻħޣȻٺòǷΣգǺûκιϵ
ǺԥľҪתҪ뿪Ҳڴʱ
ôżҪ뿪ðɡ
һͻȻ
˻һûüӦеһɾϮ
Է㵲ְȥлһӰԣ
µ˲䣬ӰѾս룬ˤħǰ
ħڿ˲䣬̱˵⣬һԥطǸ꣬תӰȥ
𣡣
ͻı˶Щס˵Ŀˢˢؾ۽ǸϣԽԽ졣
Ӱԣ
dzЩȷ˵
ȻţӦþӰԣ
ҼǵþӰԴӰʯܣħʱġ
˵ͷ
ӰԣӰӰͷĿ֮һµĵɽ
ԭΪӰˣ
(1/2)ҳ,һҳĶ
ǩĶ