A:Not do only
B:Do not only
C:Only not do
D:Not only do
关于欧洲西部叙述正确的是( )
用如图所示的滑轮组匀速提升重为480N的物体G,所用拉力F为200N,将重物提升3m所用的时间为10s不计绳重和摩擦,求:
If you do things ________, usually you can't do them well.