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【单选题】
在Oracle中,子程序就是存储过程和函数。关于子程序的描述不正确的是( )。
A.
子程序是已命名的PL/SQL块,可带参数并可在需要时随时调用
B.
子程序可以具有声明部分.可执行部分和异常处理部分
C.
子程序参数的模式只有IN和OUT两种模式
D.
子程序可分为过程和函数两种类型
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