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In Germany, public universities do not charge tuition fees.()

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下列哪种氨基酸是酸性氨基酸

A. 异亮氨酸、亮氨酸
B. 谷氨酸、天冬氨酸
C. 色氨酸、丝氨酸
D. 组氨酸、精氨酸
E. 半胱氨酸、蛋氨酸

符合光的吸收定律的分光光度计的条件是

A. 较浓的溶液
B. 较稀的溶液
C. 各种浓度溶液
D. 10%浓度的溶液
E. 5%一10%浓度溶液

Jane has seen a vision of a spinning arrow, a vision she believes tells her change is

Single parents can live a better and easier life once they divorced with their troubling partners.()