Ҫӡȫ

ġ˵:Ŵо仰˵:ŵʱ,˱㻥 仰˵ˡķ,ڸ,ڿ,...


֮ŵ,һ...

Ϊ͸Ϊͨŵý,ͨͲеŨ,ʵֹⲨ20 dB/km¼ͨŵ,״ѲάΪ...


￾202000Ǹ...

Ϲֱ: 330¹ֱ: 270 Ϲֱ: ¹ֱ: СԲֱ880


йô,Щϡ?

knknknNku߼fhmmimimnmnzbafwnmiڤmngĨmnGnunrޕniYrY...


ûи߼һĿ˺þʫ?

1894oó,֮ͭ㡶⾰ һ 1895سا,FԴʾꡣ׼ε...


ƤʲôҪˢ,Щע?

Ũ»ɫ(),Ч2%￲ƷǴ̼ԱȽϴ,ܻ,Ƥ,ܵƤ...


Ϊһ,ʲôijʶҪ֪?

3ΪһɣгзDZӴ󣬳̸ܴЦ֮䣬ʬ...


Aᡢˮᡢ,Щᵽôˢ?

һʲôˢ᣿˵򵥵ǣˢ԰лϷϽʣʹƤлøЧ ˢ᷽...


йϵ,жǿ?

һҪᶷţһʥ硣ͨްʤܡһʤ...


ÿ÷ʲô仯?

۲,ʶ,δ,Ʒó,úóԻؼ,·Ƭ,...