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问题：
[单选题]在Java语言中,下列哪些语句关于内存回收的说明是正确的? ( )
A、程序员必须创建一个线程来释放内存
B、内存回收程序可以在指定的时间释放内存对象
C、内存回收程序允许程序员直接释放内存
D、内存回收程序负责释放无用内存
参考答案：
D
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