水玻璃CO2硬化砂出现的使用时间短的原因和防止措施？

发布时间：2019-09-01 01:00 │ 来源：www.tikuol.com

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问题：

水玻璃CO₂硬化砂出现的使用时间短的原因和防止措施？

考点：型砂工型砂工题库

题型：问答题简答题

书面表达。

小明随父亲打工进城，他到一所新的学校继续读书。起初在学习上遇到一些困难，后来同学们帮助他，使他克服了困难，取得了很大的进步。

请根据上述提示信息写一篇英语短文。要求行文流畅，结构完整，语句通顺，书写规范。所给的信息须体现，但不可以逐句翻译提示内容。

_________________________________________________________________________________________________________________________________________________________.

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（1）写出乙醛的银镜反应的化学方程式______

（2）写出

与足量NaOH溶液反应的化学方程式______

（3）写出乙二酸与乙二醇发生缩聚反应的化学方程式______

（4）写出加聚产物[CH₂-CH=CH-CH₂-CBr=CH]_n的单体的结构简式______．

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题型：问答题简答题

情景交际：用方框中所给句子完成对话。

A. Don't you wish her to go to college?
B. Are you hoping any important letter?
C. Oh,well,that is not a big surprise.
D. He's good,but not very clever.
E. She always urges him to study hard.

Alice: Peter ,you keep looking through your letter box recently. 1
Peter: I'm hoping the report card from my son's school.
Alice: It seems that you and your wife have high hopes for your son.
Peter: My wife wants our son to become the top student in his grade.  2
Alice: That's because your wife wishes him to go into the best college.
Peter: Yes ,but I'm afraid she's hoping too much of the child.  3
Alice: Your son is a bit worse than the best but much better than the worst. Look at my daughter, she's a
clever girl ,but she never studies hard.
Peter:   4
Alice: It's not to be expected. Do you know what she wants to do? She's dreaming of being a dancer.
Peter:   5

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右丙氧芬属于

A．双氯芬酸钠
B．哌替啶
C．美沙酮
D．异丙肾上腺素
E．右丙氧芬

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题型：问答题简答题

现代通讯体裁的奠基人是______。

A．黄远生
B．邵飘萍
C．邹韬奋
D．范长江

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