HBV感染进入后期与传染减低的指标是()。
A.HBsAg(+)
B.抗-HBs(+)
C.HBeAg(+)
D.抗-HBc(+)
E.抗-HBe(+)
参考答案:E
We give dogs time, space and love we can spare, and _____, dogs give us their all. [ ]
A. in all
B. in fact
C. in short
D. in return
我国大气污染的污染物主要是( )。
A.粉尘 B.NO2 C.SO2 D.COE.CO2