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实验老师整理药品时，拿出一瓶久置的氢氧化钙粉末[Ca（OH） 2 ]，他让小刘和对这瓶氢氧化钙粉末的组成进行实验探究． （1）提出问题：这瓶氢氧化钙是否已经生成碳酸钙（CaCO 3 ）而变质？ （2）进行猜想：请你填写另外两种猜想 A：氢氧化钙全部变为碳酸钙；B：______C：______． （3）设计实验方案、进行实验：下表是对猜想A进行实验探究的过程，请你完成下表 实验步骤 实验现象 实验结论 取样，加适量水，搅拌，过滤 ①取少量滤液于试管中，滴入酚酞试液 ②取少量滤渣于试管中，加入盐酸 ①滤液不变色 ②有气泡产生 氢氧化钙全部变为碳酸钙 请你对猜想B参与探究，完成下表． 实验步骤 实验现象 实验结论 取样，加适量水，搅拌，过滤 ①取少量滤液于试管中，滴入酚酞试液 ②取少量滤渣于试管中，加入盐酸 ①_______ ②_______ 猜想B正确 （4）原理与用途： ①农业上一般采用氢氧化钙改良______土壤； 用氢氧化钙和______混合配制杀菌剂波尔多液，该杀菌剂______（“能”或“不能”）在铁桶中配制． ②氢氧化钙变质是由于与空气中的二氧化碳发生反应的缘故，反应的化学方程式是：______，因此氢氧化钙应______保存．
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参考答案：
举一反三
【单选题】听力原文：What's the weather forecast for today? (A) Oh yes, it's a beautiful day. (B) The newspaper is calling for sunshine all day. (C) It's expected to be done by tomorrow. (12)
A.
B.
C.
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【单选题】关于创新的正确论述是( )。 A.不墨守成规,但也不可标新立异 B.企业经不起折腾,大胆地闯早晚会出问题 C.创新是企业发展的动力 D.创新需要灵感,但不需要情感
A.
B.
C.
D.
D
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【单选题】听力原文：W: Let's talk about the preparations for the party. M: Right. I think we really need to plan better and get things done in advance this time. Still remember what a mess it was at the last party? ...
A.
It was pretty good.
B.
It was rather dull.
C.
It was not well organized.
D.
It was attended by many people.
查看完整题目与答案
【单选题】关于创新的正确论述是
A.
不墨守成规,但也不可标新立异
B.
企业经不起折腾,大胆地闯早晚会出问题
C.
创新是企业发展的动力
D.
创新需要灵感,但不需要情感
查看完整题目与答案
【单选题】单词 grill 的造词理据是 ____________ 。
A.
K （手）
B.
L （木棍）
C.
R （牛角）
D.
拟声
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【单选题】听力原文：What did the doctor say? (A) It's on the second floor. (B) I think so too. (C) He needs to run some tests. (13)
A.
B.
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【多选题】下列属于“元四家”的画家有( )。
A.
黄公望
B.
王蒙
C.
倪瓒
D.
吴镇
E.
汪士慎
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【单选题】听力原文：How much is the air-ticket to New York, please? (4)
A.
One hundred dollars.
B.
It's next to the station.
C.
Sorry, I have no money.
D.
Sony, I don't know the way.
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【单选题】听力原文： April Fool's Day started in the sixteenth century in Europe. Before that time, New Year's Day was celebrated on April 1st. Then a new calendar was introduced called the Gregorian calendar. Janua...
A.
Play jokes on others.
B.
Say 'April Fool' to others.
C.
Celebrate the New Year.
D.
Celebrate the adoption of calendar.
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【单选题】听力原文：W: Mr. Watson, I wonder whether it' s possible for me to take a vacation early next month. M: Did you fill out a request form? Q: What is the probable relationship between the two speakers? (15)
A.
Teacher and student.
B.
Doctor and patient.
C.
Manager and office worker.
D.
Travel agent and customer.
查看完整题目与答案
相关题目：
【单选题】听力原文：What's the weather forecast for today? (A) Oh yes, it's a beautiful day. (B) The newspaper is calling for sunshine all day. (C) It's expected to be done by tomorrow. (12)
A.
B.
C.
查看完整题目与答案
【单选题】关于创新的正确论述是( )。 A.不墨守成规,但也不可标新立异 B.企业经不起折腾,大胆地闯早晚会出问题 C.创新是企业发展的动力 D.创新需要灵感,但不需要情感
A.
B.
C.
D.
D
查看完整题目与答案
【单选题】听力原文：W: Let's talk about the preparations for the party. M: Right. I think we really need to plan better and get things done in advance this time. Still remember what a mess it was at the last party? ...
A.
It was pretty good.
B.
It was rather dull.
C.
It was not well organized.
D.
It was attended by many people.
查看完整题目与答案
【单选题】关于创新的正确论述是
A.
不墨守成规,但也不可标新立异
B.
企业经不起折腾,大胆地闯早晚会出问题
C.
创新是企业发展的动力
D.
创新需要灵感,但不需要情感
查看完整题目与答案
【单选题】单词 grill 的造词理据是 ____________ 。
A.
K （手）
B.
L （木棍）
C.
R （牛角）
D.
拟声
查看完整题目与答案
【单选题】听力原文：What did the doctor say? (A) It's on the second floor. (B) I think so too. (C) He needs to run some tests. (13)
A.
B.
查看完整题目与答案
【多选题】下列属于“元四家”的画家有( )。
A.
黄公望
B.
王蒙
C.
倪瓒
D.
吴镇
E.
汪士慎
查看完整题目与答案
【单选题】听力原文：How much is the air-ticket to New York, please? (4)
A.
One hundred dollars.
B.
It's next to the station.
C.
Sorry, I have no money.
D.
Sony, I don't know the way.
查看完整题目与答案
【单选题】听力原文： April Fool's Day started in the sixteenth century in Europe. Before that time, New Year's Day was celebrated on April 1st. Then a new calendar was introduced called the Gregorian calendar. Janua...
A.
Play jokes on others.
B.
Say 'April Fool' to others.
C.
Celebrate the New Year.
D.
Celebrate the adoption of calendar.
查看完整题目与答案
【单选题】听力原文：W: Mr. Watson, I wonder whether it' s possible for me to take a vacation early next month. M: Did you fill out a request form? Q: What is the probable relationship between the two speakers? (15)
A.
Teacher and student.
B.
Doctor and patient.
C.
Manager and office worker.
D.
Travel agent and customer.
查看完整题目与答案
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