-3的倒数是_________．

根据如图所示的电场线，可以判定

A．该电场一定是匀强电场

B．A点的电势一定低于B点电势

C．负电荷在B点的电势能比A点大

D．负电荷在B点的电势能比A点小

试述道家思想中的管理规律及意义。

短文填词。（共10小题，满分10分。）

Father and I left early．These shopping trips used to be Mother’s

business，so it was       (不寻常的)for us to go into town       小题1:       

t       ．We waited for over an hour before the bus drove up     小题2:       

finally．Father was        (有礼貌的)and stood by while others    小题3:       

all climbed onto it，so by the time we got         ，there were no 小题4:       

s       ．We had to stand all the way into town．At last we arrived，小题5:       

cold and       (疲惫)．“I’m hungry，”I said．Father took me to小题6:        

a r      for lunch．We were preparing to visit my grandmother，小题7:       

who lived in a cold  __(北方的)province。So we decided        小题8:________                                                                 

to get some clothes．We went from shop to shop，and b     shoes．小题9:        

It was very late       we visited the last shop for my coat． 小题10:      

对恶性肿瘤主要生物学特性的叙述，下列不正确的是（）

A.自主性、浸润性和转移性

B.遗传性

C.可转化性

D.分化异常特性

E.膜结构异常、细胞器简化及代谢异常

流入话务量等于在一个平均（）内花园发生的平均呼叫数。