Gangnam Style was issued in the middle of July last year, then it ____.
用20分度的游标卡尺测量某工件的内径时,示数如图甲所示,由图可知其长度为____ cm;用螺旋测微器测量某圆柱体的直径时,示数如图乙所示,由图可知其直径为____ mm.
下列对东南亚的开发和繁荣作出了巨大贡献的是( )