Characteristics of nitrogen leaching of rice - wheat rotation field in taihu lake area 太湖地區(qū)稻麥輪作農(nóng)田氮素淋洗特點
The magnetic bearing ( mb ) , widely used in high speed rotation field , has the advantage over conventional mechanical bearing in many aspects , such as no mechanical contact between the rotor and the bearing , no lubrication , no pollution , long - life span and so forth 由于磁軸承的轉(zhuǎn)子和軸承之間沒有機械接觸,無須潤滑,無油污染,使用壽命長,這些特點使它在高速旋轉(zhuǎn)領(lǐng)域獲得了廣泛的應(yīng)用。