典型的布局型钢包括工字钢 、 槽钢 、 三角铁和丁字钢.Typical structural steel shapes include beams, channels, angles and tees.三角铁是一种很容易掌握的简单乐器.A triangle is a simple instrument to master....
整个胃肠道具有某些共同的结构特点.The entire gastrointestinal canal presents certain common structural characteristics.她负责采购电视系列片所用的道具.She was responsible for buying the properties for the television series.那时候她帮忙管道具.She helped with the ...