________________

【名词&注释】

化学反应(chemical reaction)、质量比(mass ratio)

[单选题]________________

A. art
B. magic
C. interest
D. supper

查看答案&解析查看所有试题

学习资料：

[单选题]（ ）What’s the meaning of the sentence “She is blue today.”?

A. She is angry.
B. She is sad.
C. She is bored.
D. She is excited.

[单选题]29． Which of the following is NOT true?

A. The test is the most important for a student．
B. After class ,you should review what you have learned．
C. You should listen to your teacher and take notes carefully in class．
D. When you plan your time ,you should think of the time for eating ,sleeping and so on

[单选题]29． What does the Internet use to join the computers together?

A. Letters
B. E-mails
C. The box
D. The telephone

[单选题]在－5，－9，－3.5，－0.01，－2，－212各数中，最大的数是（ ）

A. －12 B.－9
B. －0.01
C. －5

[单选题]现将10gA和足量B混合加热，A与B发生化学反应，10gA完全反应后生成8gC和4gD，则参加反应的A与B的质量比是（     ）

A. 1：1
B. 2：1
C. 4：1
D. 5：1

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