Every tournament can be transformed into a diconnected tournament by the reorientation of just one arc.每个竞赛图只通过一条弧的改向而转变为双向连通竞赛图.Surely , EST translation study is facing temporary embarrassment : reorientation.有充分的证据表明: ...
Mariners were also able to fix their latitude by using an instrument called astrolabe.海员们还可使用星盘这种仪器确定纬度。prismatic astrolabe棱镜等高仪Other early instruments included the sextant and the astrolabe.另外的早期仪器还有六分仪和星盘.photoelectric...