UID:3665
UID:355
游堪琼:1、对卡车做受力分析、卡车受重力、支持力、 y`$qcEw 则由牛顿第三定律 y`$qcEw P=F/S=G/S=32000/0.5=64000(Pa) y`$qcEw 2、 y`$qcEw W=Gh=W η=Fsη s=2h y`$qcEw ....... (2012-05-03 20:23) y`$qcEw
UID:6452
UID:3922
UID:3623
UID:6660
UID:6925
UID:6506