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【单选题】
关于细胞因子的特征以下说法正确的是A.
一种细胞只能产生一种细胞因子
B.
细胞因子分泌增加在病理情况下是局部病变的结果
C.
细胞因子具有功能的多样性
D.
细胞因子具有组织细胞的特异性
E.
细胞因子在病理情况下是局部病变的原因
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举一反三
【单选题】Which of the following is true of the supporters of debt relief for HIPCs?
A.
They argue that free trade alone is sufficient to bring HIPCs out of poverty.
B.
They argue that new democratic governments should be forced to honor debts incurred by previous corrupt predecessors.
C.
They include Bono, the Dalai Lama, and Jeffrey Sachs among their ranks.
D.
They are working against the policies of the IMF and World Bank.
【简答题】Adobe Premiere CS4默认的视频轨道有( )条。
【简答题】Adobe Premiere CS4默认有各( )条视频轨道和音频轨道。