【简答题】Read the outline on the following topic and complete it with a thesis statement, examples and a conclusion: Topic 2: Volunteer Activity Introduction: Thesis statement: Body: Examples: Conclusion:
【简答题】我国化工专家侯德榜先生发明的“侯氏制碱法”的基本原理是:在浓氨水中通入足量的二氧化碳生成一种盐,然后在此盐溶液中加入细的食盐粉末,由于碳酸氢钠在该状态下溶解度很小,呈晶体析出,同时由于大部分酸式碳酸盐不稳定,加热后容易转化为正盐、水和二氧化碳,所以将析出的碳酸氢钠加热分解即可制得纯碱,根据以上叙述,简要回答下列问题: (1)用上述方法进行生产时,所用的起始原料有哪些?写出它们的化学式. (2)最终...
【判断题】核酸杂交是筛选基因文库最常用、最可靠的方法。
【简答题】Read the outline on the following topic and complete its body by giving 2 examples: Topic 1: Frustration Education Introduction: Thesis statement: Frustration is inevitable during our life, and frustr...