To<br/>identify Sn4+ and Sn2+ ions, the reagent can be ( ) A: Excessive ammonia B: Excessive hydrochloric acid C: HgCl2 D: Excessive Na2S

Hydrochloric acid normally helps to break down foods during digestion, but in ____amounts it can eat away at the stomach lining, producing ulcers. A: coherent B: susceptible C: stressful D: excess

能促进铁剂吸收的因素有： A: 稀盐酸(dilute hydrochloric acid) B: 叶酸(folic acid) C: 维生素 C(vitamine C) D: 鞣酸(tannin) E: 四环素(tetracycline)

同服下列哪种物质会阻碍铁剂的吸收： A: 维生素 C(vitaminC) B: 稀盐酸(hydrochloric acid) C: 碳酸氢钠(sodium bicarbonate) D: 果糖(fructose) E: 含半胱氨酸的食物

What caused the deposits A: The hydrochloric acid broke the carbon bonds in tile carbon dioxide, B: The magnesium oxide broke the carbon oxygen bonds in the carbon dioxide. C: The burning magnesium broke the carbon oxygen bonds in the carbon dioxide. D: The gas collection method broke the carbon-oxygen bonds in the carbon dioxid