单项选择题
在常用色谱技术中，下列哪种色谱技术对蛋白质样品不具有浓缩作用。（ ） A. 反相色谱 B. 离子交换色谱 C. 亲和色谱 D. 分子筛色谱
在常用色谱技术中，下列哪种色谱技术对蛋白质样品不具有浓缩作用。（ ） A. 反相色谱 B. 离子交换色谱 C. 亲和色谱 D. 分子筛色谱
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单项选择题
If Slovenia is a large country in world trade, then if it imposes a large set of tariffs on many of its imports, this would
If Slovenia is a large country in world trade, then if it imposes a large set of tariffs on many of its imports, this would
A．increase its exports.
B．harm its terms of trade.
C．have no effect on its terms of trade.
D． improve its terms of trade.