【单选题】验算滑动轴承最小油膜厚度hmin的目的是
【单选题】The Browns usually drive to the park on Sundays. But today they go to the park _____ foot.
【单选题】The students usually drive to the park on Sundays. But today they go to the park_____ .
【单选题】They go to the park( )bike.
【单选题】The Browns usually drive to the park on Sundays. But today they go to the park_____ foot.
【单选题】The Browns usually drive to the park on Sundays. But today they go to the park _____ foot.