Unfortunately, this savinginmaterial weight is balanced by the higher cost of the higher quality materials needed in prestressing.
不幸的是,这种节能材料的重量是平衡的预应力需要更高质量的材料成本较高。
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The piston with the combined magnetic ring installed may be one integral structure with slot, and this results insavinginmaterial and making cost, and easy installation of the ring to the piston.
They had ideas for building houses from the roof downwards, turning rocks into soft material, making rivers run uphill, and saving sunshine in bottles.