题目

What does it mean to say that we live in a world of persuasion? It means that we live among competing interests. Your roommate’s need to study for an exam may take priority (优先) over pizza. Your instructor may have good reasons not to change your grade. And the object of your romantic/inter??est may have other choices. In such a world, persuasion is the art of getting others to give fair and favorable consideration to our points of view. When we persuade, we want to influence how others believe and behave. We may not always prevail — other points of view may be more persuasive, dependi现有NaHCO3和Na2CO3?xH2O的混合物，为了测定x值，某同学设计了如下装置进行实验：（1）A处为加热NaHCO3和Na2CO3?xH2O混合物的装置，画出装置图    ．（2）B装置的作用是    ．（3）若在装置A中装入NaHCO3和Na2CO3?xH2O的混合物7.4克，加热到反应完全，冷却至室温时，测得B管增重3.78克，C管增重0.44克，求出x的值为    （4）你认为该装置设计得是否严密    ？（填“是”或“否”）；如果不严密，请提出一个合理的改进方案．    ．