参与氨基酸脱羧基作用
A. 维生素及
B. 维生素B12
C. 维生素B12
D. 四氢叶酸
E. 生物素
Questions 11 to 18 are based on the conversation you have just heard.
A. People take longer to learn maths.
B. People take shorter to learn maths.
C. People find maths easier as they grow older.
D. People find maths more difficult as they grow older.
[说明] 在Linux下安装配置DHCP服务,DHCP服务程序/usr/sbirddhcpd需要读取配置文件/ etc/dhcpd.conf,以下是一个DHCP配置文件的主要内容: subnet 200.1 1 7.207. 0 netmask 55,255.255.0 range 200.117.207.10 200.117.207.100; range 200.117,207.110 200.117,207.200; default-lease-time 86400; max-lease-time 604800; optionsubnet-mask 255,255.255.0; optionrouters 200.1 1 7. 207.1; optiondomain-name "myuniversity.edu.cn"; optionbroadcast-address 200.1 1 7.207.255; optiondomain-name-servers 200.1 1 7.207.3; [问题1] 此配置允许DHCP服务器分配给客户的地址范围是什么