【名词&注释】
核心部件(core component)、复分解反应(double decomposition reaction)、化合反应(combination reaction)、高纯度硅(high purity silicon)
[单选题]芯片是电脑、“智能”加点的核心部件，它是用高纯度硅(high purity silicon)制成的。下面是生产单质硅过程中的一个重要反应：SiO2 + 2C ==== Si +2CO↑，该反应的基本类型是
A. 化合反应
B. 分解反应
C. 置换反应
D. 复分解反应
查看答案&解析
点击获取本科目所有试题
举一反三：
[单选题]24． If one bad tooth is taken out ,there will be a _________ in its place．
A. hole
B. new tooth
C. healthy
[单选题])7．—Was there a nice picture on the wall?—＿＿＿＿＿＿．
A. No，there wasn't
B. No，there weren't
C. No，there isn' t
D. No，there aren't
[单选题]27． Jack didn't like to ________ when he was a student．
A. write compositions
B. do his homework
C. do the housework
D. learn science or biology
[单选题]I have thousands of classes since I started school rune years ago． But only one (51) was the most important．It happened Iast term just after I had got a (52) result in an exam．l was sad and had lost my confidence．l decided to go to a class which can tell me how to be (53) ．
A. But he did not start talking like a teacher． Instead，he held up a twenty yuan note(钞票) !
B. ( 54) 0f'us in the class put up our hands．
C. Then he put up the note on the blackboard and asked the same question． A-gain，we all put up our hands． He smiled again but said (55) ． Suddenly，he threw the note on-to the floor! Then he asked the same question a (56) time．
D. Why was he asking the same question a-gain and again? I wanted the note，(57) I put my hand up again． After a while，he (58) the note and started to laugh． "You have all just told me how to become successful． "
E. It is (59) worth 20 yuan，even though I threw it on the floor． You are like the note． Whatever happens to you，you still have your worth．
F. l may have done poorly in an exam，but it doesn't mean I can't do well in the future． If I believe in myself，l will be successful!
H. school
I. class
J. exam
K. term
[单选题]24． The sentence "Your answers are welcome． " means " ________ "．
A. You are welcome to discuss the questions with us
B. We’ve got no idea， so your answers are welcome
C. Your answers are always right
D. You can give us all the right answers
本文链接：https://www.zhukaozhuanjia.com/download/w4vny5.html
