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事物总是有大有小,大到无穷大,小到无穷小。事物的大小表现在各个方面,有形状的大小、面积的大小、距离的大小,数量的大小、容量的大小、重量的大小、力度的大小等等。 晨光熹微。了望远处的建筑工地,巍巍的塔式起重机高耸入云,各种型号的吊车正驶往工区。如果你以为起源于罗马时代的滑轮起重机,发展到今天都成了摩天巨人那就错了。起重机在朝着大型、重型的方向发展的同时也朝着小型、微型的方向发展。德国发明的微型起重滑车,自重仅1.9kg,只需5kg的拉力就能吊重
Things are always big or small, infinitely large or infinity. The size of things is manifested in various aspects, including the size of the shape, the size of the area, the size of the distance, the size of the quantity, the size of the capacity, the size of the weight, the size of the strength, and so on. Morning dawn. Looking far away from the construction site, towering tower cranes towered into the clouds and various types of cranes were heading for the construction area. If you think that the pulley cranes that originated in the Roman era have developed into giants today, they are wrong. In the direction of large-scale and heavy-duty cranes, cranes are also moving toward small and micro-scale development. Invented in Germany, the miniature lifting tackle has a self-weight of only 1.9kg and it can lift the weight with only 5kg of pulling force.