The picture shows the water purification process in the water plant. (1) When the waterworks produce tap water, the commonly used water purification methods are _ _ _ _ _ _; A. Precipitation

(1) Water purification methods used by waterworks to produce tap water include precipitation, filtration and adsorption, but do not include boiling and distillation;

(2) Alum is added as the flocculant after entering the water, and the function of adding flocculant is to make fine floating objects settle;

(3) Activated carbon is added to the attachment pool to remove the pigment and peculiar smell in the water and play an adsorption role. The water obtained by precipitation, filtration and other purification treatments often contains soluble impurities, not pure water, and chemical changes have taken place in disinfection after dosing;

(4) The glass instruments needed for laboratory filtration operation include glass rods, funnels and beakers, and the glass rods are used for drainage; If the filtrate is still turbid after filtration, the possible reason is that the filter paper is damaged and the liquid level is higher than the edge of the filter paper. Gauze can be used instead of filter paper in the family;

(5) The tap water that ordinary users get is still hard water, and boiling distillation can reduce the hardness of water;

So the answer is: (1)A, B, E; (2) settling tiny floating objects; (3) adsorption, not chemistry; (4) The funnel and beaker drain water, the filter paper is damaged, and the liquid level is higher than the edge of the filter paper; Gauze; (5)BD。