As the picture shows, from left to right, Xiaozhen, Xiaoshan and Xiaomei explore the experiment of burning conditions of substances. (Information point: When inhaling or contacting phosphorus pentoxide, (1) From the information point in the title, we can know that phosphorus pentoxide dust is a toxic substance, and both white phosphorus and red phosphorus will produce phosphorus pentoxide, so we must pay attention to avoid direct contact with phosphorus pentoxide in the experiment. From the figure, we can see that the experimental design devices of Xiaozhen and Xiaoshan are not airtight enough to allow the products after combustion to directly contact people, while Xiaomei's can't, so Xiaomei's experimental scheme is the best. So, the answer is: Xiaomei and Xiaoshan.

(2) The burning of combustible substances needs to reach the burning point of substances, while the burning point of white phosphorus is more than 200 degrees. It is impossible for the hot water in the experimental design to have such a high temperature, so red phosphorus cannot be burned. So the answer is: the temperature of red phosphorus has not reached the ignition point.

(3) As can be seen from the figure, the white phosphorus in the test tube 3 is in contact with air (or oxygen), and hot water can make it reach the ignition point, so the white phosphorus can be burned, and a large amount of white smoke is produced during combustion; The combustion of white phosphorus needs to consume oxygen, and the air in the test tube loses oxygen, so the pressure is reduced. When the pressure outside the test tube is greater than the pressure inside the test tube, the liquid level inside the test tube rises.

So the answer is: white phosphorus combustion produces a lot of white smoke, and the liquid level in the test tube rises.