问题
单项选择题
镍铬烤瓷合金中的主要成分是
A．镍
B．铬
C．钼
D．铝
E．硅
答案
参考答案：A
解析：烤瓷用非贵金属合金主要是镍铬合金，镍的含量70%，铬占25%，此外还有锰、铝、钼、硅、铁等微量元素。
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镍铬烤瓷合金中的主要成分是
A．镍
B．铬
C．钼
D．铝
E．硅
参考答案：A
解析：烤瓷用非贵金属合金主要是镍铬合金，镍的含量70%，铬占25%，此外还有锰、铝、钼、硅、铁等微量元素。
Our English teacher was like a friend to us, and we all liked her. One day she came into the classroom and shouted,“Who did this?”She held up a piece of broken glass and asked,“Who ___1___ the window?”She seldom became angry.___2___ this time she was. I broke the window. I had done __3__ by throwing a baseball. I didn’t want to admit (承认) it __4__ I didn’t have enough money to pay for a big window like that.“My father will be __5__,”I thought. At first I didn’t __6__ my hand, but later something strong in my heart suddenly made me stand up.“I did it,”I said __7__ .How difficult it was for me to say that! My teacher __8__ a book from one of our book shelves and then began walking __9__ my desk. I was afraid that she was going to punish(惩罚) me. “I know you like collecting __10__ very much,”she said, looking down at my __11__ face.“Here is the book about collecting stamps that you are looking for. Now, the book is __12__ and I shall not punish you. Remember, it’s because you __13__ the truth.” I couldn’t believe it! My teacher wasn’t punishing me. I didn’t __14__ to pay for the broken window. And I got my favourite book! As time goes, the book is __15__,so is my wonderful teacher. But I will never forget the lesson the teacher gave me that day.
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