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zhua lao lu mian
Author(s): 
Pages: 32-33
Year: Issue:  7
Journal: Children's World

Keyword:  抓牢路面;
Abstract: <正>为什么卡车和拖拉机需要那么大的车轮呢?因为大车轮可以帮助它们在打滑的路面增加摩擦力,在拉动重物时进退自如。
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