罐头质量不好或超过保质期会给身体造成损害。选择罐头要讲究方法,归纳起来是“看”、“算”、“验”三个字。看是看外形标志及内容物。马口铁罐头表面清洁无斑锈,底和盖稍凹进,焊缝和底部卷边无损伤,封口严密不变形者一般就是好罐头;玻璃罐头盖稍凹进,内容物不浑浊,无沉淀、不 Poor quality or more than can result in damage to the body. Choose cans to pay attention to methods, summed up as “look”, “count”, “test” three words. See is the appearance of signs and content. Tinplate canned surface clean no rust, bottom and cover a little concave, weld and the bottom curling no damage, sealing is not deformed the general is good cans; glass can lid slightly recessed, the content is not turbid, no precipitation, no