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【单选题】
活化Th2细胞表面对B细胞活化第二信号产生具有主要作用的分子是:A.
CD28
B.
CD40L
C.
CD4
D.
CD8
E.
ICAM-1
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反馈参考答案：
举一反三
【单选题】毛泽东在1949年建国前说,总结我们的经验,集中到一点,这就是( )
A.
建立工人阶级领导的以工农联盟为基础的人民民主专政
B.
建立工农专政
C.
建立无产阶级专政
D.
建立工农兵联合政府
【单选题】Sailing vessels are stand-on over power-driven vessels except ______.
A.
in a crossing situation
B.
in a meeting situation
C.
when they are the overtaking vessel
D.
on the inland waters of the PR China
【单选题】Avoid this area. No possibility for vessels to turn
A.
It`s advisable for vessels to turn here
B.
It`s impossible for vessels to turn here
C.
It`s impossible for vessels to avoid this area
D.
It`s advisable for vessels to enter this area
【简答题】预防天花的人痘接种法是人工免疫的先驱,其发明的时间最迟是在 。
【单选题】Sailing vessels are stand-on over power-driven vessels EXCEPT .
A.
in a crossing situation
B.
in a meeting situation
C.
when they are the overtaking vessels
D.
on the inland waters of the PR China
【单选题】There is a ______ when one or more vessels are towing or pushing another vessel or vessels，provided that they are all involved in commercial activities and not in a salvage operation．
A.
private safety
B.
private maritime adventure
C.
common safety
D.
common maritime adventure
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