下列哪一项属于多发性创伤（）。 A.颅骨骨折、头皮血肿 B.脊柱骨折伴神经系统损伤

如图16-3-8所示，在质量均为m的A、B两球之间，用轻弹簧将它们连着，然后放于光滑的水平面上.如果A球被水平射来的速度为v₀的子弹击中，并嵌入球中，且子弹质量为，问在以后的运动过程中：

图16-3-8

(1)弹簧的弹性势能的最大值为多少?

(2)B球的最大动能为多少？

A．问题B．准备C．快D．晚上E．贵F．非常

你______什么时候回家看妈妈

阅读理解

     In order to know a foreign language thoroughly(完全地), four things are necessary.   First,  we must

understand the language when we hear it spoken.   Secondly,  we must be able to speak it ourselves, 

 with confidence(自信) and without hesitation(犹豫).   Thirdly,  we must do much reading.   Finally,  we

must be able to write it.   We must be able to make sentences that are correct in grammar.  

     There are no shortcuts to success in language learning.   A good memory is a great help,  but it is not

enough only to memorize the rules from a grammar book.   It is not much learning by heart long lists(一

览表) of words and their  meanings,  studying the dictionary and so on.   We must learn by using the

language.  

      If we are pleased with a few rules we have memorized,  we are not really learning the language.  

We must "learn through use.  " Practice is important.   We must practise speaking and writing the language whenever we can.  

1.   The most important things to learn a foreign language are_____________. 

A.   understanding and speaking  

B.   listening,  speaking,  reading and writing

C.   writing and understanding      

D.   memorizing and listening

2.   Someone hears and writes English very well, but he speaks it very badly.  This is because__.   

A.   he doesn't understand the language when he hears it spoken

B.   he doesn't have a good memory

C.   he always remembers lists of words and their meanings

D.   he often hesitates(犹豫) to practise speaking it

3.   One can never learn a foreign language well by _____.   

A.   doing much practice        

B.   studying the dictionary

C.   learning through use        

D.   using the language

4.   Which is the most important in learning a foreign language?

A.   A good memory.    

B.   Speaking.        

C.   Practice.      

D.   Writing.  

5.   "Learn through use" means __________.   

A.   we use a language in order to learn it

B.   we learn a foreign language in order to use it

C.   we can learn a language well while we are keeping using it    

D.   B and C.  

LHRHa与体内LHRH的主要区别是（）

A.结合的受体不同

B.LHRHa是受体阻断剂

C.半衰期不同

D.LHRHa是受体拮抗剂

E.两者无区别

工单填写时要求时限：3G用户（），非3G用户（）。