GMmMm7d2?8dR?2R2, F2?G?G,F1?F?F2??G?GMm22222dR?R?R?R????2?d?8d?8d?8dd?????????2?2?2?2?????M'mMmȥСʣಿֶʵmΪGMm7d2?8dR?2R2R??8d2?d??2??2
6-3 ɡɡĴ
һ˼·ǡϵ
1ϵṩԲ˶
GMmv2?2??22?ma?m?m?r?m??r?m(2?n)rDZ½ 2rr?T?2ϵܵƵܵٶȣDZ½ĸ
2GMm?mg,gΪӦ2rv2?2???m?2r?m??r,gΪӦٶȣѣ3ϵmg?mr?T?֪g
Ĺ ģһͣ
̸һ̸ǵ壬ΪԲ˶ǵṩԲ˶GͻǵvءTrй㣨ֻܹܹ㻷ǵ
2Mm4?2r3?2??֪rT:G2?m?. ?r?M?2rGT?T?Mmv2rv2?M?. ֪rv:G2?mrrG2Mmv2v3T?2??֪Tv:G2?m?m??r?M?.
rr2?G?T?ģͶͣ
̸һ̸ûǵ壨ǣ֪еɺתӰ죬дԹ㡣
9
2