炉渣的软熔特性对高炉冶炼有什么影响？
参考答案：炉渣的软熔特性与矿石的软化特性有关，其对高炉冶炼的影响是，矿石软化温度愈低，初渣出现得愈早，软熔带位置越高，初渣温度低，进入炉缸后吸收炉缸热量，增加高炉热消耗；软化区间愈大，软熔带融着层愈宽，对煤气流的阻力愈大，对高炉顺行不利。
所以，一般难度希望矿石软化温度要高些，软化区间要窄些。这样软熔带位置较低，初渣温度较高，软熔带融着层较窄，对煤气阻力较小。一般难度矿石软化温度波动在900~1200℃之间。
| 阅读理解。 |
| One day, a little monkey and a little fox went out to play. They saw an apple tree on the other side of the river. There were many big and red apples on it. But there was no bridge over the river. The monkey thought hard and had an idea. They pulled down a tree and put it over the river as a bridge. The monkey said, "My old friend, you go there first." But after the fox went to the other side, he kicked (踢) the tree into the river and ran to the apple tree. "How can I get there without the tree?" cried the monkey. The fox laughed and said, "You just stand there and watch me eating the apples." The monkey was very angry. Suddenly it began to rain. The water level (水位) in the river rose (上涨) and tree flew away with the water. "You can eat all the apples. But you can't come back," shouted the monkey. The fox stopped eating and looked at the monkey sadly. |
| 1. The little monkey and the little fox wanted to _____ on the other side of the river. |
[ ] |
| A. build a bridge B. eat the apples C. pull down a tree D. play games |
| 2. The fox kicked the tree into the river because he wanted to _____. |
[ ] |
| A. eat all the apples by himself B. share the apples with the monkey C. get the apples first D. play a joke on the monkey |
| 3. The fox could not come back because _____. |
[ ] |
| A. the monkey had taken away the tree B. the tree had flown away C. it began to rain D. he was angry with the monkey |
| 4. The fox was sad because ______. |
[ ] |
| A. the monkey was laughing B. he couldn't reach the apples C. he couldn't come back D. the monkey went home first |
| 5. The story tells us that _____. |
[ ] |
| A. the fox shouldn't go first B. the monkey should go first C. the fox was cleverer than the monkey D. one shouldn't care only about himself |
