0  9544  9552  9558  9562  9568  9570  9574  9580  9582  9588  9594  9598  9600  9604  9610  9612  9618  9622  9624  9628  9630  9634  9636  9638  9639  9640  9642  9643  9644  9646  9648  9652  9654  9658  9660  9664  9670  9672  9678  9682  9684  9688  9694  9700  9702  9708  9712  9714  9720  9724  9730  9738  447090 

5.What are the speakers mainly talking about?

       A.A best - seller author.

       B.The woman' s new book.

       C.A wedding reception.

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4.What is the probable relationship between the speakers?

       A.Doctor and patient.

       B.Teacher and student.

       C.Policeman and driver.

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3.What does the man suggest the woman do?

       A.Take more rest.          B.Talk to her boss.          C.Give up her job

 

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2.Where are the speakers?

       A.In a library.             B.In a hospital.           C.In a classroom.

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1.What happened to the woman yesterday?

       A.She missed the dinner party.

       B.She was angry at the dishes.

       C.She was hurt by the man.

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       答案是B。

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       A.£19.15.                        B.£9.15.                          C.£9.18.

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   (2)质量为m1He核,以速度v0轰击质量为m2静止的质量数为14的氮核,发生了核反应,最终产生两种新粒子A和B。其中A为O核,质量为m3,速度为v3,B的质量为m4

        ①写出核反应方程式;

②计算粒子B的速度v4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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D.将辐射光子,光子的频率为

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