1ůʹБ(yng)ÑעЩ?
𣺢ه(yn)ôײȡڇ(yn)˽Բɢ۳ܺd≥2T/m2摪(yng)|oݵbʯĻ(f)ϵذއ(yn)ߜI(y)߱|ЙCԡҺDzů(ji)(yng)עMˮB(yng)o
2Ժĵůa(chn)ƷF(xin)B©Ҫԭʲôԓ̎?
F(xin)B©a(chn)ԭҪʹ|(zh)εļӟĿ͑ů˾ۺ(w)ܾS깩ůfů\л̎àB(ti);F(xin)}Ǽӟ͉ܵܲ͟(yng)ԓQӟÑ(yng)b˾؟(z)b˾Ҳ(yng)ܲa(chn)S؟(z)p(zh)Vã߀茣ДǷܶZSСr(sh)~ܸһůb˾@rаl(f)Ӗ(xn)ǑKʹ
⣬ҲųÑڵůRøߜwpĹܵMˮض^ߌ(do)´ι^ѡǾҪԭҵ؟(z)ˣ֓(dn)pʧMa䁡xдI(y)a(chn)ĹܲĺҎ(gu)İb˾ȞҪ
3
ˮůϵy(tng)ͨ{(dio)ԇ(yng)Ҫcʲô?{(dio)ԇ?
ϵy(tng)ͨ{(dio)ԇǴ_Mһ˺͙zO(sh)Ӌcʩ|(zh)һҪh(hun)(ji)J(rn)Mԇ\Еrμӟˮؑ(yng)(yn)^һҪƽ(wn);_(gu)ضһ׃m(yng)^
ʼӟr{(dio)ԇˮؑ(yng)ƽˮضȑ(yng)ڴˮ(dng)rh(hun)ضȸ10Ҳ(yng)32(yng)Bm(x)\48СrԺÿ24Сrˮ3ֱ_(d)O(sh)Ӌˮضڴ˜ض(yng)ÿMˮˮBӵļӟ·M{(dio)(ji)ֱ_(d)O(sh)ӋҪ
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Bm(x)Ї߃rֵƷ50ИI(y)
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ůϵy(tng)ĂҪԭ