单项选择题

1.关于细胞因子,下列叙述错误的是() A.
A.一般是小分子蛋白质       B.
 B.与CKR结合后才能发挥作用    C.
 C.主要以内分泌方式发挥作用    D.
 D.生物学效应具有拮抗性   E.
 E.生物学效应具有重叠性

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单项选择题
二叉树的先序遍历又简称为( )。 A、LDR B、DLR C、LRD D、以上均不正确
未分类题
It can be inferred from the passage that ______.A.American women were not treated as equals of their male counterparts in the 18th centuryB.there were many female scholars in America in the 18th centuryC.Abigail Adams lived to see her dreams come trueD.Abigail Adams was not satisfied with her husband because of his tyranny
A.A.American
B.there
C.Abigail
D.Abigail
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