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问题 判断题

多台电动机线路上熔丝的额定电流，等于线路上最大一台电动机额定电流的1.5～2.5倍。

答案

参考答案：错

补全对话，情景问答
补全对话
A. That's true.  
B. How did you like it?
C. The concert ended at 10:00 p. m.
D. I went there with my parents.
E. How did you go there?
F. It was called '6Saving the Children".
G. The concert was held for collecting money for poor children.
 
A: Hi, Kate!  Did you go to the concert last night?
B: Yes,    1   
A:    2   
B: Wonderful. Many famous singers sang at the concert.    3   
A: What does it mean?
B:    4    You know many children in the world don't have enough food.
A:    5   
B:I think people all over the world should help them.
A: That's right!
1. _____ 2. _____ 3. _____ 4. _____ 5. _____
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不定项选择题

将等物质的量的A、B混合于2 L的密闭容器中，发生下列反应：3A（g）+B（g）xC（g）+2D（g），经4min后测得D的浓度为0.5mol/L，c（A）：c（B）=3：5，以C表示的平均速率v（C）=0.125mol·L-1·min-1，下列说法正确的是 [ ]

A．以B表示的平均反应速率为v（B）=0.13 mol·L-1·min-1

B．该反应方程式中，x=2      

C．4min时，A的物质的量为0.75mol

D．4min时，A的转化率为50％

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