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要合并两个顺序文件，则必须先以Output模式打开它们。To merge two sequential files, you must first open them in output mode.

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要合并两个顺序文件，则必须先以Output模式打开它们。To merge two sequential files, you must first open them in output mode.

A.正确

B.错误

参考答案:

答案：错误

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