【简答题】On the intake stroke, the intake valve is open. The piston moves down, pulled by the rotation of the .
【单选题】汽车生产企业适应市场的需求,生产环保省油的汽车的行为是( )营销观念的代表特征。
【简答题】公差等级为8级的基准孔的公差带代号为__________。
【简答题】看图,按要求完成填空。 图中尺寸∅25H8中,H8表示孔的公差带代号,H为孔的基本偏差代号,8为孔的标准公差等级代号;尺寸∅25f7中,f7表示( )的( ),f为轴的( ),7为轴的 (
)。
【单选题】The Chief Tally would like to inquire()the rotation of the discharging ports.
【判断题】Lao zi once said that‘Heaven does not speak in words.It speaks through the rotation of the four seasons and the growth of all living things.’
【单选题】The rotation of the flagella is driven by a flow of
【单选题】The hole should be( ) with the rotation of the work.
【判断题】The main motion of the cylindrical grinder is the rotation of the workpiece.
【简答题】Φ39H8/f7是齿轮和轴套的配合代号,其中公称尺寸为39mm,孔的公差带代号是 ,轴的基本偏差代号是 ,轴的标准公差等级为 。