问题
单项选择题
加氢缓蚀剂一般具有中和和成膜双重作用，其中成膜成分是某种表面活性物质，其分子是由头部和尾部组成，其中头部的的作用是（）。
A、吸附在金属上的极性基团
B、吸附在金属表面上的水分
C、吸附流过金属表面的某些油组分及其他烃类组分
D、吸附在金属上的某些腐蚀介质
答案
参考答案：A
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加氢缓蚀剂一般具有中和和成膜双重作用，其中成膜成分是某种表面活性物质，其分子是由头部和尾部组成，其中头部的的作用是（）。
A、吸附在金属上的极性基团
B、吸附在金属表面上的水分
C、吸附流过金属表面的某些油组分及其他烃类组分
D、吸附在金属上的某些腐蚀介质
参考答案：A
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| Some thirty years ago, I was studying in a public school in New York. One day, Mrs. Nanette O'Neil gave an arithmetic 1 to our class. When the papers were 2 she discovered that twelve boys had made the same mistakes throughout the test.? There is really nothing new about 3 in the exams. Perhaps that was why Mrs O'Neill didn't even say a word about it. She only asked the twelve boys to 4 after class. I was one of the twelve. Mrs. O'Neill asked 5 questions, and she didn't 6 us either. Macaulay, she wrote on the blackboard the 7 words by Thomas Macaulay. She then ordered us to 8 these words into our exercise-books one hundred times.? I don't 9 about the other eleven boys. Speaking for myself I can say: it was the most important single 10 of my life. Thirty years after being introduced to Macaulay's words, they still seem to me the best yard-stick(准绳), because they give us a 11 to measure ourselves rather than others.? 12 of us are asked to make 13 decisions about nations going to war or armies going to battle. But all of us are called upon daily to make a great many personal decisions. Should the wallet, found in the street, be put into a pocket or turned over to the policeman? Should the 14 change received at the store be forgotten or 15 ? Nobody will know except you. But you have to live with yourself, and it is always better to live with someone you respect.? | ||||
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