Lower and raise the ramp to see how the Angle of inclination affects the parallel forces acting on the file cabinet.

把斜坡抬高或放低，看倾斜角度如何影响文件盒上的平行作用力。

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My files are in the file cabinet, my keys hang by the door, and my wallet goes on the little table in the hall.

我的文件在文件夹里，钥匙在门上挂着，钱包在客厅的桌子上。

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Give the command to open up the customer database file stored on your disk, which is similar in concept to manually opening up the customer file in a filing cabinet.

发出命令，以便“打开”存储在磁盘中的顾客数据库文件，从概念上讲“打开”既类似于用手打开文件柜中的顾客文件。

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