干扰素抗病毒感染的机制是()
A.直接干扰病毒mRNA的转录
B.阻止病毒进入易感细胞
C.诱导细胞产生抗病毒蛋白
D.影响病毒装配
E.抑制病毒的释放
参考答案:C
Barack Obama delivered a speech to 500 local youths during his visit to China, many of ____ from Fudan
University and Tongji University.
A.them
B.whom
C.which
D.who
在射线能量值相同的情况下,内照射危害最大的是()
A.α射线照射
B.β射线照射
C.γ射线照射
D.β、γ射线混合照射
E.特征X射线照射