Depends on the circumstances.
Raw flour and starch are both common in life as an ingredient in thickening food, both have relatively high nutritional value as well as food value, and in most cases can be replaced by each other, but some special or specified to use starch food, then you can't replace it with raw flour.
2 The difference between raw flour and starchRaw flour is actually starch, but starch is not necessarily raw flour.
Raw flour is also known as starch, mainly made from potatoes and corn, mainly used in stir-fry thickening, sizing, etc., with water absorption, adherence and smooth and clean features, there are many types, mainly corn starch, white flour, sweet potato flour and kudzu powder, etc., but the starch is not necessarily a raw flour, such as corn starch and white flour in Guangdong are known as raw flour in Fujian, Zhejiang and the area is known as starch, which is called starch. The area is called starch, which is too poor in water absorption, can not be used for soup and porridge, otherwise it is easy to become thin and affect the taste when cooled. So raw flour is a kind of starch, but starch is not necessarily starch, so in the use of time must be clear.
3 starch generally refers to what starchStarch is a white powdery substance, which contains a lot of sugar, is a kind of polymer carbohydrate, mainly by the glucose molecule polymerization, has a strong absorption, from the plant maize and sweet potatoes and potatoes extracted from the natural substances.
4 What can be substituted for starchIt can be replaced by potato treatment.
In general, it is not recommended to use other seasonings instead of starch, because they do not have the role of starch as well as practicality, but if you are in a hurry to use in cooking, then you can find a few potatoes over, these potatoes peeled and washed and cut into shredded or sliced, put in water to soak for a while and then fished out, and the remaining water is left to stand for a period of time, and finally the rest is the water starch, which can be used to do dishes.