萘系中料如果直接卤化会形成较多副产物,因此,萘环上的卤代基主要是通过()反应或()反应获得。
参考答案:桑德迈尔;希曼
用所给词的适当形式填空。
Hello! Boys and girls. I'm David. I'm a reporter from School Life Radio Station. Thank you for
1_____ (listen) to me. I'm in Australia now. It's sunny today. It's a very beautiful place 2_____ (have)
fun. There 3_____ (be) lots of people here on vacation. Some 4_____ (lie) on the beach. Others
5_____ (swim) in the sea. The water is clean and blue. Look at the group of boys 6_____ (play)
beach volleyball. They 7_____ (look) cool. A girl 8_____ (sit) under the sun umbrella and drawing
pictures. Everyone 9_____ (have) a good time! What are you doing now? I hope you can
10_____ (have) a good time, too.
患儿,女,7岁,因"发作性意识丧失3个月"来诊。发作10余次/d,每次持续10余秒,发作时不摔倒,可由过度呼吸诱发。
为明确诊断应进行的检查有()。
A.脑脊液检查
B.血常规
C.血生化
D.脑电图
E.颅脑CT或MRI
F.颅脑X线片