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【单选题】
设有两个事务T1、T2,其并发操作如图1所示,下面描述正确的是 _______ 。 时刻 事务T1 事务T2 数据库A的值 T0 read (A) A=10 T1 A=A*A T2 write(A) A=100 T3 read (A) A=100 T4 rollback 图1 事务并发操作图A.
该操作不存在问题
B.
该操作不能重复读
C.
该操作丢失修改
D.
该操作读“脏”数据
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反馈参考答案：
举一反三
【单选题】患者男,68岁。因左下肢静脉曲张行大隐静脉高位结扎术。术后指导其使用弹力绷带的正确方法是
A.
由近心端向远心端包扎
B.
包扎后应能触及足背动脉搏动
C.
手术部位的弹力绷带应缠绕更紧
D.
包扎前应下垂患肢
E.
两圈弹力绷带之间不能重叠
【单选题】In the circular-flow diagram,
A.
firms are buyers in the markets for goods and services.
B.
households are sellers in the markets for the factors of production.
C.
firms are sellers in the markets for factors of production and in the markets for goods and services.
D.
dollars that are spent on goods and services flow directly from firms to households.
【单选题】In the circular-flow diagram,
A.
income from factors of production flows from firms to households.
B.
goods and services flow from households to firms.
C.
factors of production flow from firms to households.
D.
spending on goods and services flow from firms to households.
【单选题】The two flows represented in the circular-flow diagram are:
A.
. the flow of goods and services and the flow of factors.
B.
. the flow of households and firms.
C.
. the flow of money and the flow of goods and services.
D.
. the flow of factors and the flow of money.
【简答题】背《将进酒》,底下录音上传。唱歌也行,歌声录音上传。
【单选题】Among the characteristics of the circular flow in a market economy is:
A.
firms sell goods and services in the product market.
B.
households spend earnings from resource sales on goods and services in the product market.
C.
firms hire resources sold by households in the factor market.
D.
all of these are characteristic of the circular flow in a market economy.
【简答题】收入的循环流(circular flow 0f income)
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