???????

????????????????25%50%?????????? 60%???????????????????????????????????????????????????????????????5%10%??????????30%46%????? ? [] ?????????????25-50??????????????????????????????20-50????????????????? [???] 1.????????????????????????? 2.???????????????????? 3.???????? 4.?????????????k?? [] 1.????6??15cm???? 2.????? 3.??? 4.??????????? [?] 1.??N??? 2.???????????????? [] 1.????? 2.????????????? 3.??? [??] ???50??????????????????????????????? ???? ????????????? ???????????????????????????????????...