1ůʹБ(yng)ÑעЩ(xing)?
𣺢ه(yn)ôײȡڇ(yn)˽Բɢ۳ܺd≥2T/m2摪(yng)|o(h)ݵbʯĻ(f)ϵذއ(yn)ߜI(y)߱|ЙC(j)ԡҺDzů(ji)(yng)עMˮB(yng)o(h)
2Ժĵůa(chn)ƷF(xin)B©Ҫԭʲôԓ̎?
F(xin)B©a(chn)ԭҪʹ|(zh)εļӟ?yn)Ŀ͑ů˾ۺ?w)ܾS깩ůf(shu)ů\(yn)л̎àB(ti);F(xin)(wn)}Ǽӟ͉ܵܲ͟(yng)ԓQӟ䁡Ñ(yng)b˾؟(z)Σb˾Ҳ(yng)ܲa(chn)S؟(z)p(zhng)(zh)V߀茣ДǷܶZSСr(sh)~ܸһ(g)ůb˾@r(sh)аl(f)Ӗ(xn)ǑKʹ
⣬ҲųÑڵůRøߜwpĹܵM(jn)ˮض^(gu)ߌ(do)´ι^(gu)ǾҪԭҵ؟(z)֓(dn)pʧM(jn)a(b)x(gu)дI(y)a(chn)ĹܲĺҎ(gu)İb˾ȞҪ
3
ˮůϵy(tng)ͨ{(dio)ԇ(yng)Ҫc(din)ʲô?{(dio)ԇ?
ϵy(tng)ͨ{(dio)ԇǴ_M(jn)һ˺͙z(yn)O(sh)Ӌ(j)cʩ|(zh)һ(g)Ҫh(hun)(ji)J(rn)M(jn)ԇ\(yn)Еr(sh)μӟˮؑ(yng)(yn)ƣ^(gu)һҪƽ(wn);_(gu)(du)ضһ(g)׃m(yng)^(gu)
ʼӟr(sh){(dio)ԇˮؑ(yng)ƽˮضȑ(yng)ڴˮ(dng)r(sh)h(hun)ضȸ10ңҲ(yng)32(yng)Bm(x)\(yn)48Сr(sh)Ժÿ24Сr(sh)ˮ3ֱ_(d)O(sh)Ӌ(j)ˮضڴ˜ض(yng)(du)ÿMˮˮBӵļӟ·M(jn){(dio)(ji)ֱ_(d)O(sh)Ӌ(j)Ҫ
һƪ
Bm(x)Ї(gu)߃r(ji)ֵƷ50(qing)ИI(y)
һƪ
ůϵy(tng)Ă(g)Ҫԭ