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【单选题】
CTL杀伤靶细胞时,描述正确的是( )A.
CTL无需与靶细胞接触
B.
靶细胞被溶解时，CTL同时受损
C.
一个CTL只能杀伤一个靶细胞
D.
CTL特异性杀伤靶细胞
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举一反三
【简答题】When did Mark Twain move to Hannibal?
【单选题】被称为机体抗感染“先头部队”、“主力军”和“边防军”的分别是:
A.
lgG IgA IgM
B.
IgM SIgA lIgG
C.
lgG IgM SIgA
D.
IgM IgG SIgA
【简答题】油菜的施肥原则足施足基肥,平施 苗 肥、 _________ 、 _________ 和 _________ 。
【单选题】How was the Project received when Mark first sent his invitation?
A.
Mark received responses from 53 schools.
B.
There were about 1,500 bags decorated with one announcement.
C.
It was a huge success, which, to a great extent, was due to the power of the Internet.
D.
R was a hit among the schools but the local supermarket was quite reluctant to offer their bags at first.
相关题目：
【单选题】被称为机体抗感染“先头部队”、“主力军”和“边防军”的分别是:
A.
lgG IgA IgM
B.
IgM SIgA lIgG
C.
lgG IgM SIgA
D.
IgM IgG SIgA
参考解析：
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