汉坦病毒的核酸类型是
A.多片段单负链RNA
B.单片段单负链DNA
C.单片段单正链DNA
D.多片段单正链RNA
E.单片段单正链RNA
参考答案:A
Mike invited me ______ tennis this weekend.
A.play
B.to play
C.playing
D.played
危险标识您知道哪些?