属于低度危险物品的是()
A.静脉穿刺针
B.气管镜
C.导尿管
D.听诊器
E.输液器材
参考答案:D
some of the beer here— perhaps you will enjoy it.
A.Try
B.Trying
C.To try
D.Have tried
组成DNA的基本碱基是A、C、G、T;而组成RNA的基本碱基是A、C、G、U。