What are the drugs that are often used jointly to destroy helicobacter pylori? A: Omeprazole + clarithromycin + amoxicillin or metronidazole B: Colloidal al-magnesium mixture + colloidal bismuth subcitrate + lansoprazole C: Ranitidine + sucralin + prostaglandin E D: Colloidal bismuth subcitrate + prostaglandin E+ sucraland

What isthe essential characteristic of colloid? A: Tyndall effect B: Brownian motion C: Colloidal particles size ranges from1nmto 100nm D: colloidal particles charged

Which of the following statements is false: ( ) A: Suspended solids are unstable and can be easily removed from the water. B: The colloidal particles are usually charged by adsorbing ions. C: The sizes of dissolved matters are less than 1 nm. D: The pollution of natural water only comes from the natural environment.

The efficiency of coagulation process is not good during the condition of low temperature, because ( ) A: coagulants will not hydrolyze completely B: the hydration of colloidal particles is enhanced, which hinders the coagulation process C: the viscosity of water is high, so the Brownian motion is weak, making it difficult for colloids to aggregate D: The rate of coagulants hydration is too high