【单选题】The fossil consists of a complete skull of an archaeocyte, an extinct group of ancestors of modern cetaceans. Although limited to a skull, the Pakicetus fossil provides precious details on the origin...
B.
adaptations for diving
【单选题】轴承代号为6308,其轴承内径为()mm。
【单选题】滚动轴承6308,表示内径为()的球轴承。
【简答题】轴承6308的轴承类型是(),轴承内径() mm。
【判断题】在PowerPoint 2000中,可以在动作按钮的设置中来设置幻灯片的动画效果。