A.手臂肘前区 B.正中静脉 C.头静脉 D.贵要静脉
A.5~10s B.10~15s C.10~20s D.5~15s
A.5℃~10℃低温保存 B.0℃~4℃低温保存 C.0℃~5℃低温保存 D.10℃~20℃低温保存