工业上用纯碱、石灰石、水为原料来制取烧碱，发生的化学反应有（_爱下问搜题

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问题填空题

工业上用纯碱、石灰石、水为原料来制取烧碱，发生的化学反应有（1）______（2）______，（3）______，这里面不包含______反应．

答案

（1）碳酸钙在高温条件下分解生成氧化钙和二氧化碳．

该反应的化学方程式为：CaCO₃

高温

.

CaO+CO₂↑，属于分解反应．

（2）氧化钙与水化合生成氢氧化钙．

该反应的化学方程式为：CaO+H₂O=Ca（OH）₂，属于化合反应．

（3）氢氧化钙与碳酸钠反应生成碳酸钙沉淀和氢氧化钠．

该反应的化学方程式为：Ca（OH）₂+Na₂CO₃=2NaOH+CaCO₃↓，属于复分解反应．

所以，制取烧碱过程中没有发生置换反应．

故答案为：

（1）CaCO₃

高温

.

CaO+CO₂↑；

（2）CaO+H₂O=Ca（OH）₂；

（3）Ca（OH）₂+Na₂CO₃=2NaOH+CaCO₃↓ 置换反应．

完形填空

I ran into a stranger as he passed by, and I at once apologized to him. We were both very _36_, he stranger and I. Then we went    37 our way after saying good-bye.
But at home a 38 story is told. Later that day, when I 39 supper in the kitchen, my daughter suddenly stood behind me very 40 . When I turned back, I     41 knocked her down. “Don’t be in my   42   !” I shouted angrily. She walked away with her little heart     43 .On the kitchen floor later, I found some flowers by the door.
That night, while I lay     44 in bed, a voice in my deep heart said, “While 45 with a stranger, you are so polite, but with the children you love, you are so easily _46   .Why are there some flowers by the door? Those are the flowers she brought for you. She    47 them herself, pink, yellow and your favorite blue. She stood quietly in order to give you a    48 , and you never saw the         49 in her eyes.”
By this time, I felt very       50 and now my tears began to fall. I quietly went and knelt (跪下) by her __51__, “Wake up, little girl, wake up,” I said, “Are these the flowers you picked for me?” She smiled, “Yes, because I knew you’d like them, especially the 52_  .” I said, “Daughter, I’m sorry for the way I acted today; I       53 have shouted at you that way.”
She said, “Oh, Mom, that’s okay. I love you 54 .” I hugged her and said, “Daughter, I love you too, and I do like the flowers.”
Through this    55 , I realize what FAMILY means:
FAMILY="(F)ATHER" (A)ND (M)OTHER, (I) (L)OVE (Y)OU

D．disappointed

C．shouldn’t

单项选择题

有关脑膜病变的MR扫描方法，错误的是（）

A.包括全颅脑的横断位T1、T2加权

B.包括全颅脑的冠状位T2加权

C.平扫发现病变才做增强扫描

D.平扫未发现病变一定要做增强扫描

E.增强扫描至少有一个脉冲序列要加脂肪抑制技术