我国男性公民的劳动年龄通常为()周岁
A.16-60
B.16-55
C.18-60
D.18-55
参考答案:A
29. It is during the Second World War ____he died.
A.when
B.after
C.before
D.That
EBV感染常用的检测方法有()
A.原位杂交
B.嗜异性凝集试验
C.EBVDNA检测
D.EBV抗体检测
E.多聚酶链反应