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【单选题】
( )SQL查询语言的一种典型是:SELECT X1,X2, ....,Xn FROM A1, A2, ...., Am WHERE F,其中Xi(i=1,2,...n)、Aj(j=1,2,....m)、F分别是那个选项?A.
基本表名、目标表属性名、逻辑表达式
B.
基本表名、目标表名、数据表
C.
目标表属性名、基本表名、逻辑表达式
D.
目标表名、基本表名、数值表达式
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举一反三
【简答题】All processes share a semaphore variable mutex , initialized to 1. Each process must execute wait(mutex) before entering the critical section and signal(mutex) afterward. Suppose a process executes in...
【简答题】课本第176页2(1)
【单选题】Suppose that a process is in “Blocked” state waiting for some I/O service. When the service is completed, it goes to the __________
A.
Running state
B.
Ready state
C.
Suspended state
D.
Terminated state
【单选题】Suppose that a firm in an industry subject to diminishing returns to scale is initially in long run equilibrium. Which of the following will not be part of the industry adjustment process to a permane...
A.
Some firms will temporarily make economic profits.
B.
Some new firms will enter.
C.
The long run equilibrium price will be higher than the initial equilibrium price.
D.
All of the above will be consequences.
【简答题】All processes share a semaphore variable mutex , initialized to 1. Each process must execute wait(mutex) before entering the critical section and signal(mutex) afterward. Suppose a process executes in...
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