The impellers are kept in their proper relationship to each other by spur gear.液轮之间借助于正齿轮保持彼此正常的关系.Mainly by the impellers, pump body and pump cover composition.主要由叶轮 、 泵体和泵盖组成.Welding is one of the important technologie...
He wrote a book descriptive of the frontier provinces.他写了一本描写边疆各省的专著.Design . This qualitative study has a cross - sectional and descriptive - explorative design.尽管如此, 目前有关他们体验的相关研究却非常有限.Descriptive statistics involves t...
People are affected to different extents by what they see on television.人们不同水平地受到电视节目的影响.Ninety percentage of the usable natural grasslands have deteriorate to various certain extents.中国90%的可利用天然草原有不同程度的退化.Returns the pa...