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- 单项选择题假定已经定义了一个名为arr_type的PL/SQL表类型，那么怎样实例化一个arr_type类型的变量（）
A、v_arr arr_type;
B、v_arr is arr_type;
C、v_arr of arr_type;
D、v_arr arr_type%type;
- A
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