1. When fermenting noodles with baking powder in cold days, you should first use warm water to mix the noodles and put the `food` next to the stove fire or put the basin in hot water, after a while, the dough will be fermented.

2. When you use baking powder to make noodles in cold days, if you add some sugar, this will not only shorten the fermentation time, but also have better results.

3. The growth temperature of yeast is about 30C, and as long as it reaches this temperature, the dough will rise very quickly, otherwise, even if it takes a long time to rise, it will not make the dough rise.

4. The family generally use baking soda as baking powder, when using baking soda can be added to a certain amount of vinegar, so that the steamed buns are not only soft and warm, and the alkali flavor is not big.