整体式滑动轴承装配应按哪些步骤进行?
参考答案:压入轴套;
将轴套定位;
修整轴套孔;
检验轴套的圆度误差及尺寸;
检验轴套孔中心线对轴套端面的垂直度等。
Brussels, the capital city of Belgium, is ________ home to the European Union, ________ organization of European nations. [ ]
A. the; an
B. a; an
C. 不填; an
D. 不填; the
胎儿心脏胚胎发育关键时期是在妊娠
A.2~12周B.12~20周C.20~28周D.28周后E.28~37周