中继站能否使用定向天线？为什么？

某公司进口一批生羊皮，请根据所提供的单据，完成相关的判断题。

报检时须提供无木质包装声明。()

（8分）在匀强电场中，将一电荷量为的负电荷由点移到点，其电势能增加了，已知、两点间距离为，两点连线与电场方向成角，如图16所示，则：

（1）在电荷由移到的过程中，电场力做了多少功？

（2）、两点间的电势差为多少？

（3）该匀强电场的电场强度为多大？

When I was eight, I saw a movie about an island that had an erupting volcano and jungles filled with wild animals．The island was ruled by a beautiful woman called Tondalaya, the Fire Goddess of the Volcano．It was a low budget movie, but to me, it represented the perfect life．But through the years, Tondalaya was forgotten．

The week I turned 50, my marriage came to a sudden end．My house, furniture and everything I'd owned was sold to pay debts that I didn't even know existed．In a week I had lost my husband, my home and my parents who had refused to accept a divorce in the family．

I'd lost everything except my four teenage children．I used every penny I had to buy five plane tickets from Missouri to Hawaii．Everyone said I was crazy to think I could just run off to an island and survive．I was afraid they were right．

I worked 18 hours a day and lost 30 pounds because I lived on one meal a day．One night as I walked alone on the beach, I saw the red orange lava（火山岩） pouring out of Kilauea Volcano in the distance．It was time to live my imagination!

The next day, I quit my job, bought some art supplies and began doing what I loved．I hadn't painted a picture in 15 years．I wondered if 1 could still paint．My hands trembled the first time I picked up a brush．But after an hour had passed, I was lost in the colors spreading across the canvas（画布） in front of me．And as soon as I started believing in myself, other people started believing in me, too．The first painting sold for $ 1500．

The past six years have been filled with adventures．My children and I have gone swimming with dolphins, watched whales and hiked around the crater rim （火山口边缘） of the volcano．We wake up every morning with the ocean in front of us and the volcano behind us．

The dream I had more than 40 years ago is now reality．I'm living freely and happily ever after．

小题1:Why did the writer go to Hawaii?

A．To make a living．

B．To spend her holiday．

C．To free herself from trouble．

D．To realize her childhood dream．小题2:Which of the following is the writer's dream?

A．Get close to wildlife．

B．Live a free and happy life．

C．Live in nature with animals.

D．Become a successful painter．小题3:We can infer from the passage that _____．

A．the writer had never done painting before

B．the writer's parents encouraged her to divorce

C．the writer's husband took away most of her money

D．the writer wasn't sure whether she could survive in Hawaii at first

导致延髓背外侧综合征的病变闭塞的血管是（）。

A.椎动脉或小脑后下动脉

B.后交通动脉

C.大脑后动脉

D.大脑前动脉

E.大脑中动脉

患者，女性，51岁，劳动时足底被刺伤。患者全身肌肉强直性收缩，阵发性痉挛，诊断为破伤风。

药物治疗宜采用的抗生素是

A．青霉素
B．甲硝唑
C．罗红霉素
D．万古霉素
E．磺胺药