根据不同材质、厚度及层数的包装袋，有下加热及上下加热两种封口方式供选择；
According to different material, thickness and layers of packaging bags, a heating and sealing the upper and lower heating two ways to choose.
下面根据钱币的不同材质，简单介绍中国钱币的主要种类。
According to different material of the coin, and briefly introduces the main kinds of China's COINS.
而真皮和织物的坐垫，也需要根据材质的不同采取不同的处理方法。
While the leather and fabric cushion, also need to take a different approach according to the different materials.
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