有机物X为食品包装纸的常用防腐剂。已知: ①X的相对分子质量小于150,其中氧的

题型:推断题

问题:

有机物X为食品包装纸的常用防腐剂。已知:

①X的相对分子质量小于150,其中氧的质量分数约为44.4%

②1molX在稀硫酸中发生水解反应生成2mol甲醇和1molY

③Y可使溴的四氯化碳溶液褪色

根据以上信息填写下列空白:

(1)1个X分子中,可能含有______________个氧原子

(2)X可以发生的反应有______________(填序号)

①加成反应  ②酯化反应  ③氧化反应  ④消去反应

(3)Y分子中没有支链,其结构简式是______________,

(4)写出Y的同分异构体的结构简式______________(任写一种)

(5)写出X在一定条件下发生加聚反应得到高分子化合物的结构简式:______________        

(6)写出X在足量氢氧化钠溶液中反应的化学方程式:____________________________            

考点:有机物的推断
题型:推断题

Yesterday was my stepmom’s birthday. I hadn’t been home for a long time so I wanted to stop by the house to see her on this special day.

I have been struggling financially so I was afraid of the long trip. Gas is so expensive nowadays! Anyway, I filled my tank with gas and set off.

I stopped at the shopping mall and found a present. It was the perfect gift and I knew she

would love it. But when I got to the cashier my card was declined! I did not have enough money in my account to pay for the gift!

So I pondered the issue for a few minutes. I could put it back and get something cheaper, but I knew there was nothing else in the store she would like as much. So, I got on my smart-phone and transferred some money from my savings account so I was able to pay for the gift. It took a big chunk of my savings but I wanted her to have something special.

She loved the gift and I felt that even though I had spent almost all my money my stepmom deserved the best and I was glad I gave her the best that I could.

Before leaving my parents’ house, my dad took me to one side and, with our secret hand-shake, he gave me some money. I had not said anything to him about my finances but I guess my dad had just known it. When I got to the car, I saw the amount he gave me was three times what I had spent on the gas and the gift!

It goes to show that doing the right thing always comes with great rewards.

小题1:Why was the writer unwilling to have a long trip?

A.Because gas was hardly available.

B.Because the writer was short of money.

C.Because the writer didn’t like driving.

D.Because the road was difficult to drive on.小题2:The underlined word “pondered” in Para. 4 means ________.

A.thought about

B.tried on

C.depended on

D.got through小题3:From the passage, we can infer that ________.

A.the writer loves his/her stepmom very much

B.the gift the writer bought was loved by his/her father very much

C.the writer spent all his/her savings buying the gift for his/her stepmom

D.the gift the writer bought was the most expensive one in the shop小题4:Why did the writer’s father shake hands with the writer in secret?

A.Because he wanted to ask the writer for something special.

B.Because he wanted to give the writer some money.

C.Because he knew the writer had been struggling financially.

D.Because he didn’t want others to copy their handshake.

题型:推断题

床层压力对循环流化床锅炉燃烧的影响是什么?

题型:推断题

一般认为,风险是由风险因素、风险事故和损失三个要素构成的。在风险管理中,损失一般是指( )。

A.经济损失

B.物质损失

C.精神损失

D.实质损失

题型:推断题

手外伤清创时处理方法正确的是( )

A.争取在6-8小时内进行

B.骨折与脱位均尽可以当时予以复位固定

C.对未失活的皮肤尽量充分保留

D.不用止血带

E.注意保护重要的神经和血管

题型:推断题

( )是进行制造管理的指导性文件。

A.制造工艺方案

B.制造合同

C.质量计划

D.设计图纸

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