单选题对于ORACLE PL/SQL标识符（Identifier）的有效长度是（）A16位B18位C24位D30位E32位
单选题
对于ORACLE PL/SQL标识符（Identifier）的有效长度是（）
A
16位
B
18位
C
24位
D
30位
E
32位
参考解析
解析：
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