问题
单项选择题
熔融石萤水口不宜浇注16Mn系列的钢种，主要是因为钢中（）与水口中的二氧化硅反应，加强水口的侵蚀。
A.Mn
B.Si
C.Al
D.Fe
答案
参考答案：A
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熔融石萤水口不宜浇注16Mn系列的钢种，主要是因为钢中（）与水口中的二氧化硅反应，加强水口的侵蚀。
A.Mn
B.Si
C.Al
D.Fe
参考答案：A
| 完形填空。 Mary was ill, so she went to see __1__. "Doctor, I'm not feeling __2__," said Mary. "Every time I do my homework, I feel __3__. If I go to school on foot, I have to sit down and __4__ for a few times." The doctor looked over her __5__. At last he said, "__6__ serious(严重的), but I'm afraid you are eating too much." "I don't understand. What do you mean(意思)?" asked Mary. "I mean you eat __7__ food," said the doctor. "Oh! You mean I'm too __8__. That's a problem," said Mary. "What should I do?" "The answer is easy," said the doctor. "If you want to be thinner and healthier, you __9__ eat a lot of food and you should also do much __10__." | ||||
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