变动成本是指在相关范围内，其总额随业务量成比例变化的那部分成本。
谋大事、讲战略、是当今做好网络空间治理的一个重大基本出发点是（） ["共享","互通","深刻理解","重运筹"]
What is high availability？（） [" redundant infrastructure"," clustering of computer systems"," reduced MTBF"," continuous operation of computing system"]
影响火灾的气象因素包括（）。 ["大风","降水","高温","雷击","爆炸"]
（）是现代人文教育的重要内容和手段。 ["人文学科教育与人文实践活动相结合","接近自然、善待自然","让学生学做进步的现代人","探索科学"]
因果研究
