单项选择题 任何一种网络操作系统都必须保证网络通信环境具有( ).A、集成性和可靠性B、集成性和透明性C、安全性和可靠性D、集成性和可管理性

未知题型 The selection of the date was rather _______, since it mattered little to most of the club members who were free during the holidays.A. arbitraryB. ambiguousC. thoroughD. fundamental

单项选择题 在统计分析中能用来找出影响产品质量主要因素的一个有效工具是()。