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【多选题】
关于创建新进程的描述正确的是()A.
fork() 创建子进程中，会复制父进程的所有变量和内存
B.
子进程的fork()返回0
C.
父进程的fork()在创建子进程成功后，返回子进程标识符
D.
fork() 创建子进程中，会复制父进程的页表
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A.
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B.
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C.
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D.
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