6.质量为lkg的质点在 平面上运动,x方向的速度一时间图像和y方向的位移一时间图像分别如图甲、乙所示,下列说法正确的是 ()v/(ms-1)y/m86430 1 22 t/s01甲乙 A.质点的初速度大小为4m/s B.质点所受的合力为2N C.质点做直线运动 D.2s末质点的速度大小为8m/s ...
PROBLEM TO BE SOLVED: To prevent poor fitting of a door handle to a door outer panel, improve its welding and prevent its shrinkage with respect to the door outer panel. ;SOLUTION: A door panel structure includes a reinforcement 12 joined on the inner side of a door outer panel 2 by wa...