谁能告诉我地球为什么有地心引力.

来源:学生作业帮助网 编辑:作业帮 时间:2024/10/01 23:47:01
xWnYY&ȑg}FQfY6`y@ qT0iV?V9uiF]$̽uzzKK*ea5Kyń57t:A e;{}oxr?١z4|e7uXF;^N-iڷrDyБ=/UxӠFS. gVp~bSe+[ 2j~"jvlm}|\)ts=8"԰XamUvڼߧ< :'4ղEdp9{-$S~d1PWiy `՟XA.f 5a"J'윎GH%ztsk6|HWjXIP+)tWٴ]Dv5!f+LgUqp$ۆXGc7y*ڐi:*dFR(v:޹I>H& @ޢ0 ҇,1*gs97^y Hp/{ᥲn30>J2,Y~X"[0 A'):_NvvJZA¢qƏg RFy#0.Bu d߉qnƽͧ_u CF6'Tb 7nV: ̒04D{OyͶ̔Q(eИ[!T mKٶ?S U IJ" SigpDrs9uFhh]gQg g guAWMۉCTO<:e*`>9O\KNjoZa hV3=3@> 6%2l *NL22a1cԁJs D̩d7hgIXY#gRJ*3,CeS(-8)+s}%?y`GLA,;,Bra=L`}*wIi^30srZ[=IN9b,]] u= f5pYzDX)ŖHF"W 努/3jկԋ[)5<ݺ