医院病床编设的原则:一级医院病床数不少于多少张( )
A.20B.500C.60D.400E.70
参考答案:A
从括号中选出适当的词填空,把句子补充完整。
1. California is a city of (America, Canada).
2. (Where, What) does an elephant live?
3. Are there many (city, cities) in this country?
4. My mother works (on, in) Beijing.
5. My little sister is (younger, older) than me.
6. East points (left, right) on the map.
Ethernet交换机是利用“端口/MAC地址映射表”进行数据交换的。交换机实现动态建立和维护端口/MAC地址映射表的方法是( )。
A.人工建立
B.地址学习
C.进程
D.轮询