屋顶的两面斜面都有破瓦片.On both slopes of the roof there are broken tiles.伽利略让小金属球从斜面滚下.Galileo rolled small metal balls down the incline.图3.21画出了平行于斜面的、相互保持平衡的几个力.Figure 3.21 shows the forces parallel to the plane that are respons...
Sorry to keep you, Jack...很抱歉让你久等了，杰克。Profit margins have been slashed to the bone in an attempt to keep turnover moving.为了维持资金周转，利润率已被降为最低。Whatever is left over may be put into the refrigerator, where it will keep for 2...