2 yuan, or 3 per specific gas mixtures used in the food industry in professional packaging machine or continuous movement of the packaging line. 2 yuan, or 3 per specific gas mixtures used in the food industry in professional packaging machine or continuous movement . 2 yuan, or 3 per specific gas mixtures used in the food industry in professional packaging machine or continuous movement of the packaging line. 2 yuan, or 3 per specific gas mixtures used in the food industry in professional packaging machine or continuous movement .2 yuan, or 3 per specific gas mixtures used in the food industry in professional packaging machine or continuous movement of the packaging line. 2 yuan, or 3 per specific gas mixtures used in the food industry in professional packaging machine or continuous movement ...