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【单选题】
数据库管理技术的发展经历了三个阶段，它们的先后顺序是A.
文件系统阶段、人工管理阶段、数据库系统管理阶段
B.
文件系统阶段、数据库系统管理阶段、人工管理阶段
C.
人工管理阶段、文件系统阶段、数据库系统管理阶段
D.
人工管理阶段、数据库系统管理阶段、文件系统阶段
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【判断题】从2019年4月1日起,一般纳税人发生增值税应税销售行为或者进口货物,原适用16%税率的,税率调整为13%;原适用10%税率的,税率调整为9%。( )
A.
正确
B.
错误
【简答题】You are a tour guide. A tourist of your group suffers at night from high fever after catching cold and call you for helping taking him to hospital for emergency treatment. (游客感冒高烧,帮忙送医院进行紧急治疗,和游客进行对话)...
【单选题】Raisin bran and milk are complements. An increase in the price of raisins will
A.
increase consumer surplus in the market for raisin bran and decrease producer surplus in the market for milk.
B.
increase consumer surplus in the market for raisin bran and increase producer surplus in the market for milk.
C.
decrease consumer surplus in the market for raisin bran and increase producer surplus in the market for milk.
D.
decrease consumer surplus in the market for raisin bran and decrease producer surplus in the market for milk.
【单选题】Raisin bran and milk are complementary goods. A decrease in the price of raisins will
A.
increase consumer surplus in the market for raisin bran and decrease producer surplus in the market for milk.
B.
increase consumer surplus in the market for raisin bran and increase producer surplus in the market for milk.
C.
decrease consumer surplus in the market for raisin bran and increase producer surplus in the market for milk.
D.
decrease consumer surplus in the market for raisin bran and decrease producer surplus in the market for milk.
【简答题】Transfer 模型的功能是什么?
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