| 摘要 |
measuring an amount of static electricity which is generated due to friction of a real wheel and a flat surface and separating the type of the flat surface in accordance with the amount of the static electricity measured; and closely contacting a brush through a motor gear, a dustcloth bar gear and a flat plate gear into the flat surface in accordance with the type of the separated flat surface. During the procedure of the cleaning, when the flat surface is a floor, the brush is descended by a predetermined period and the cleaning is completed by the dustcloth bar and the brush.
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