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回答下列问题：
（1）充分煅烧110吨石灰石得到固体66吨，则石灰石中碳酸钙的质量分数为 %。
（2）假设第①步反应完全进行，则第②步反应过滤后得到的不溶液性滤渣的成分为
。
（3）第③步反应一般不采用通入CO2的主要原因是 ，相应的离子方程式为 。
（4）CaCO3是一种难溶液物质，25℃时其KSP=2.8×10-9。现将等体积的CaCl2溶液与Na2CO3溶液混合，若Na2CO3溶液的浓度为2.0×10-4mol/L，则生成沉淀所需CaCl2溶液的物质的量浓度最小是 。
（5）某生用石灰石为原料，设计了另一种制备碳酸钙的实验方案，其流程图如下
与前一方案相比较，该方案的优点是 。 查看习题详情和答案>>
用方框内所给句子，完成对话。注意有一项多余。注意：请将选项前的字母代号填在题前的横线上。
A： Could you tell me how much it costs to fly to Hainan?
B：1.________________
A： From Beijing.
B： 2._______________is 1,000 yuan one way.
A： Could you tell me if there is a flight in the morning on November, 26?
B：3._______
I have to check my computer. Yes, there is a flight at 8:15 in the morning.
A：Great! 4._________
B： 5.___________
A：Round-trip. We’ll return on the 8 of December. 6._________
B：Yes. Four tickets on November 26 “ to Haikou and returning to Beijing on December 8”.
A．The price of a ticket from Beijing to Haikou
B．Just a minute, please.
C．Where are you flying from?
D．Would you want one-way or round-trip?
E. Is that possible?
F. I’d like to book four tickets, please.
G. Do you want to know more about it?
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用方框内所给句子，完成对话。注意有一项多余。注意：请将选项前的字母代号填在题后横线上。（共6小题；每小题1分，满分6分）
A: Jim, you said you would not stay out late after school, didn’t you??
B: 1
A: But it’s 10 o’clock now. 2
B: Sorry. I’ve been to the hospital.
A: What? 3
B: No. I sent Jack to the hospital.
A: _ 4 What was wrong with him?
B: He had a terrible headache on the way home.
A: 5
B: Yes, he is.
A: Good for you, my dear! I’m very glad you can help others.
B: 6
| A. What should I do? B. Thank you, mom. C. Where have you been? D. Is he better now? E. Oh, really? F. Were you sick? G. Yes, mom, I did. |
A: Jim, you said you would not stay out late after school, didn’t you??
B: 1
A: But it’s 10 o’clock now. 2
B: Sorry. I’ve been to the hospital.
A: What? 3
B: No. I sent Jack to the hospital.
A: _ 4 What was wrong with him?
B: He had a terrible headache on the way home.
A: 5
B: Yes, he is.
A: Good for you, my dear! I’m very glad you can help others.
B: 6
F. Were you sick? G. Yes, mom, I did. |
用方框内所给句子，完成对话。注意有一项多余。注意：请将选项前的字母代号填在题后横线上。（共6小题；每小题1分，满分6分）
A: Jim, you said you would not stay out late after school, didn’t you??
B: 1
A: But it’s 10 o’clock now. 2
B: Sorry. I’ve been to the hospital.
A: What? 3
B: No. I sent Jack to the hospital.
A: _ 4 What was wrong with him?
B: He had a terrible headache on the way home.
A: 5
B: Yes, he is.
A: Good for you, my dear! I’m very glad you can help others.
B: 6
E. Oh, really? F. Were you sick? G. Yes, mom, I did. |
1. ______ 2. ______ 3. ______ 4. ______ 5. ______ 6. ______
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