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【单选题】
弗雷德里克·莱恩在()一书中介绍了十五世纪上半叶威尼斯商业繁荣的景象和管理经验。A.
《大趋势》
B.
《国富论》
C.
《理想藏书》
D.
《威尼斯商人安德烈亚·巴巴里戈》
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】离心泵的主由( )、( )、泵轴、吸入管、排出管等组成。
【简答题】称取25mg 蛋白酶配成25mL 溶液,取2mL 溶液测得含蛋白氮0.2mg,另取0.1mL 溶液测酶活力,结果每小时可以水解酪蛋白产生1500mg酪氨酸,假定1 个酶活力 单位定义为每分钟产生1mg酪氨酸的酶量,请计算: (1)酶溶液的蛋白浓度及比活。 (2)每克纯酶制剂的总蛋白含量及总活力。
【简答题】What is the explanation of animal-behaviour experts for the “clever” behaviour of pets?
【单选题】1ml酶液每小时产生1500mg酪氨酸。定义：每分钟产生1mg酪氨酸的酶量为1个活力单位（或一个酶单位u）。则1毫升酶液所含的酶单位
A.
400U
B.
200U
C.
100U
D.
250U
【简答题】称取25mg蛋白酶配制成25ml 酶溶液,从中取出0.1ml 酶液,以酪蛋白为底物,用Folin-酚比色法测定酶活力,得知每小时产生1500ug 酪氨酸,另取2ml 酶液,用凯氏定氮法 测得蛋白氮0.2mg,若以每分钟产生1ug 酪氨酸的酶量为1个活力单位计算,根据以上数据,求出: (1) 1ml 酶液中所含蛋白质量及活力单位。 (2)比活力 (3) 1g酶制剂的蛋白含量及总活力。
【单选题】From the information in the passage, an important reason for the decision of the United States to build a canal was to ______.
A.
develop trade relations with Europe
B.
improve relation with South American countries
C.
stop European ships reaching the Pacific Ocean
D.
build a canal through Panama would be a better choice
【单选题】To maintain that South Koreans are dumping their VCRs in the United States is to maintain that:
A.
Koreans are selling VCRs in the United States below their production cost
B.
Koreans are selling VCRs in the United States above their production cost
C.
The cost of manufacturing VCRs in Korea is lower in Korea than in the United States since wages are lower in Korea
D.
The cost of manufacturing VCRs in Korea is higher in Korea than in the United States since wages are higher in Korea
【判断题】Is camp behaviour different from established norms about the traditional male way of doing things?
A.
正确
B.
错误
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