When you do it in a standing position, keep your abs and lower back tight to support your spine.
当你站在它的位置，让您的绝对值和腰部紧来支持你的脊椎。
The vacuum snap-back thermoforming techniques of ABS resin, and the vacuum snap-back thermoforming technology, materials, equipments, molds and process charts are described in detail.
介绍了ABS树脂的真空吸塑成型技术，详细阐述了真空吸塑工艺，并探讨了原料、设备、模具对工艺的影响及成型工艺条件的控制。
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