题目

When you wave to a friend, you are using body language. When you smile at someone you mean to be friendly. When you put one finger in front of your mouth, you mean “be quiet.” Yet, people in different countries may use different body languages. Once an Englishman was in Italy. He could speak little Italian. One day while he was walking in the street, he felt hungry and went into a restaurant. When the waiter came, the Englishman opened his mouth, put his fingers into it and took them out again and moved his lips. In this way, he meant to say, “ Bring me something to eat.” But t下列装置所示的实验中，能达到实验目的是（ ）A．除去Cl2中的HCl杂质B．实验室制取NH3C．定量测定H2O2分解化学反应速率D．c为粗铜，d为纯铜，溶液为硫酸铜溶液，电解精炼铜