脐带断面中央有
A.一条脐静脉,两条脐动脉
B.一条脐动脉,一条脐动脉
C.两条脐静脉,一条脐动脉
D.两条脐静脉,两条脐静脉
E.两条脐静脉
参考答案:A
Which of the following statements describe(s) the properties of a purely segmented memory system Ⅰ.It divides memory into units of equal size Ⅱ.It permits implementation of virtual memory Ⅲ.It suffers from internal fragmentation
A. Ⅰ only
B. Ⅱ only
C. Ⅲ only
D. Ⅰand Ⅲ
患者,女,20岁。有失眠史1年余。现因大学生活紧张再度失眠,且较前加重,经常入睡困难,或醒后难以再寐,伴心烦心悸,善惊易恐,头晕健忘,神疲乏力,面色少华,肢体倦怠,纳少,舌淡苔脉细弱。
其治法为()
A.补气
B.健脾
C.滋阴
D.益气镇惊,安神定志
E.补益心脾,养心安神