成人如出血量达()毫升以上,可发生休克而危及生命。
参考答案:800
.
Just because they make more money than I do, ___________they seem to look down on me.
A.so
B.and
C.but
D.不填
母血AFP值测定胎儿畸形的最佳时间()
A.6~9周
B.16~20周
C.22~25周
D.20周左右
E.24周