现行PC中,UO端口常用的I/O地址范围是( )。
A. 0000H~FFFH
B. 0000H~30FFH
C. 0000H~3FFFH
D. 0000H~03FFH
出口加工区内企业不能从事的业务是( )。
A. 转口贸易
B. 进料加工
C. 来料加工
D. 与转口贸易和进料加工相关的仓储、运输业务
汇编语言指令中惟一不可缺少的域是( )。
A. 标号名字域
B. 助记符域
C. 操作数域
D. 注释域
The desert is full of activities in summer nights because ______.
A. it is cooler and safer for most animals at night
B. animals can find food in the dark
C. it is easy for animals to find water at night
D. animals cannot sleep at night