在医疗服务中,采取自我保健方法或预防措施,预防疾病发生,称为一级预防,又称()
A.三早预防
B.二级预防
C.临床预防
D.三级预防
E.病因预防
参考答案:E
Tommy wanted to read more, so he asked his friend if there was to read. [ ]
A. something easy enough
B. something enough easy
C. enough easy something
下面关于ARP协议的描述中,正确的是()
A.ARP报文封装在IP数据报中传送
B.ARP协议实现域名到IP地址的转换
C.ARP协议根据IP地址获取对应的MAC地址
D.ARP协议是一种路由协议