已知关系:STUDENT(sno,sname,grade),以下关于命令 “CREATE CLUSTER INDEX s_index ON student(grade)”的描述中,正确的是
A. 按成绩降序创建了一个聚簇索引
B. 按成绩升序创建了一个聚簇索引
C. 按成绩降序创建了一个非聚簇索引
D. 按成绩升序创建了一个非聚簇索引
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肌酸激酶-MB在急性心肌梗死发病后几小时开始升高( )
A. 1~2小时
B. 3~8小时
C. 14~18小时
D. 18~24小时
E. 35~36小时
According to the passage , what happens when the temperature is increased in a closed container holding a liquid
A. The liquid and the gas phases become more similar.
B. The liquid and the gas become less dense.
C. The container expands.
D. The liquid evaporates out of the container.
运算符___________的优先级最高。
A. .[ ]
B. +=
C. :
D. ++
设有数组定义:char array[]=”student”;则数组所占的存贮空间为__________。
A. 6个字节
B. 7个字节
C. 8个字节
D. 9个字节