一台微机共有32MB内存，则其高内存区的内存为（）
A. 640KB
B. 384KB
C. 约64KB
D. 32MB
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测试JRJC-66/345型交流二元继电器的磁路平衡？
Which two statements about views are true? （）
A view can be created as read only.
B. A view can be created as a join on two or more tables.
C. A view cannot have an ORDER BY clause in the SELECT statement.
D. A view cannot be created with a GROUP BY clause in the SELECT statement.
E. A view must have aliases defined for the column names in the SELECT statement.
下列选项中，不属于防腐层检查内容的是（）。
A. 外观检查
B. 致密性检测
C. 厚度测定
D. 粘结性检测
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