【单选题】【消耗次数：1】
操作系统需为用户提供以下哪一项？
①
编译程序
②
工作环境
③
帐号
④
图形界面
参考答案：
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系统调用是操作系统向用户提供的程序一级的服务。用户编制程序时，调用系统调用命令，经过编译后，形成若干参数和以下哪一项？
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