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【单选题】
当两种商品中的一种商品价格发生变动时,该两种商品的需求量向不同方向变化,则这两种商品的需求交叉价格弹性为A.
正值
B.
负值
C.
零
D.
不确定
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皮皮学刷刷变学霸
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A.
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B.
支气管痉挛或支气管狭窄及粘液栓阻塞
C.
腺体肥大、增生，浆液腺粘液腺化生
D.
支气管壁纤维组织增生
E.
平滑肌断裂，软骨萎缩
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A.
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B.
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C.
move the audience to action.
D.
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A.
CD20是所有T细胞共同的表面标志
B.
CD4存在于Th细胞表面
C.
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