由HBV的C基因编码的产物是
A.HBsAgB.HBcAgC.HBeAgD.抗-HBsE.抗-HBc
参考答案:B
木条、镁条、氢气都能在氧气中燃烧,其变化的本质和现象有不少共同之处,如反应都需要点燃.请你再归纳出它们的四个共同点:
(1)___________________;
(2)___________________;
(3)___________________;
(4)___________________.
___he daydreamed, Peter saw figures in the sky.
A.Until
B.Since
C.While
D.During