假没“图书”表中有C型字段“图书编号”,要求将图书编号以字母A开头的图书记录全部打上删除标记,可以使用SQL命令( )。
A. DELETE FROM图书FOR图书编号="A"
B. DELETE FROM图书WHERE图书编号="A%"
C. DELETE FROM图书FOR图书编号="A*"
DELETE FROM图书WHERE图书编号LIKE="A%"
查看答案
A necessary cause is _____.
A. one without which it is impossible for the effect to occur
B. one of the causes that can produce the effect
C. one that is enough to make the effect occur
D. none of them
在Visual FoxPro中,关于属性、事件、方法的叙述错误的是( )。
A. 属性用于描述对象的状态
B. 方法用于表示对象的行为
C. 事件代码也可以像方法一样被显示调用
D. 基于同一个类产生的两个对象的属性不能分别设置自己的属性值
What the author discussed in the previous section is most probably about _____.
A. classification of reasoning
B. some special types of reasoning
C. relationships between causes and results
D. some other common types of reasoning
下列哪项是渗出液与漏出液的区别要点
A. 外观
B. 细胞数
C. 有无炎症细胞
D. 有无蛋白质
E. 有无红细胞