A、B、C、D、E是中学常见的5种化合物,A、B是氧化物,元素X、Y的单质是生活

题型:问答题

问题:

A、B、C、D、E是中学常见的5种化合物,A、B是氧化物,元素X、Y的单质是生活中常见的金属,相关物质间的关系如图所示.

请回答下列问题:

(1)X的单质与A反应的化学方程式是______.

(2)若试剂1是NaOH溶液,X的单质与试剂1反应的离子方程式是______.

(3)若试剂1和试剂2均是稀硫酸.

①检验物质D的溶液中金属离子的方法是______.

②将物质C溶于水,其溶液呈酸性,原因是(用离子方程式表示)______.

③某高效净水剂是由Y(OH)S04聚合得到的.工业上以E、稀硫酸和亚硝酸钠为原料来制备Y(OH)SO4,反应中有NO生成,该反应的化学方程式是______.

考点:无机推断
题型:问答题

阅读理解。

       What do you think the future will be like? Here are some answers from some students.

Mary: Everyone will have a computer at home. There will also be many machines in the future. Then people will

         work only two or three days in a week.

Jack: The weather in he future will be very hot. People can't live on the earth. They will have to look for (寻找)

         another planet to live on.

Linda: I think the life in the future will be nice. There will be a lot of flowers and

         trees. And cities will look like parks.

Henry: Every family will have a family doctor, so people will be

          seldom ill (很少生病) They will live to 120 years old.

1. They are talking about _______. [ ]

A. computers

B. the weather in the future

C. family doctors

D. the life in the future

2. What does Mary think the life will be like in the future? [ ]

A. Machines will help people with their work.

B. Everyone will have a new house.

C. People will live a long life.

D. There will be no doctors.

3. The word "planet" means "             " in Chinese. [ ]

A. 飞船

B. 宇宙

C. 星球

D. 岛屿

4. Why does Jack think people will have to look for another planet to live on? [ ]

A. There will be many flowers and trees

B. The earth will be too hot.

C. There will be too many people.

D. There will be too many machines.

5. Who is worrying about (担心) the life in the future? [ ]

A. Mary

B. Jack

C. Linda

D. Henry

题型:问答题

犯罪行为的发生的防御机制主要包括()、()、()、()。

题型:问答题

关于骨髓的说法错误的是()

A.红骨髓有造血功能

B.黄骨髓无造血功能

C.黄骨髓可转化为红骨髓进行造血

D.成人红骨髓主要分布于长骨骨干

E.成人红骨髓主要分布于长骨两端

题型:问答题

单冲压片机调节片重时,应调节

A.上冲头下降深度

B.下冲头下降深度

C.上、下冲头同时调节

D.加料量

E.加料速度

题型:问答题

人耳能听到的频率为()。

A.15~20000Hz

B.15~18000Hz

C.20~18000Hz

D.20~20000Hz

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