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By asking these fundamental questions, the author tries to persuade us to change our view

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物理结构设计阶段与具体的DBMS【】。

从静态的观点看，操作系统的进程是由程序段、数据和【】三部分组成。

听力原文： The teacher stood with his back to the fireplace on a winter morning. He decided to give good advice to the pupils before starting the lesson.
"Before you speak, think. Count 50 before you say anything important, 100, if it is very important".
The lips of his pupils were moving in unison, and suddenly they burst out in chorus: "99, 100. Your coat tails are on fire, Sir".
The teacher stood with his back to the【11】on a winter morning. He decided to give good【12】to the pupils before starting the lesson.
"Before you speak, think. Count 50 before you say anything important, 100, if it is very important. "
The lips of his pupils【13】in unison, and suddenly they【14】out in chorus: "99, 100. Your coat tails are on【15】, sir".

背景：
某住宅小区工程，个体户张某受现场工长私下雇用，组织人员进行QTZ315型塔吊安装。张某从市场租来一台汽车吊并找来8名民工，口头向大家分配了任务。在安装完塔身、塔顶、平衡臂后，着手安装起重臂。起重臂作为细长构件，吊装时对吊点位置、吊索的拴系方式、重心所处位置均有严格的技术要求。按规定本应设置3个吊点、6根吊索，而张某等人仅设了2个吊点、4根吊索，并且在吊索未拴牢的情况下，将起重臂吊起。起重臂根铰点销轴安装完毕后， 6名工人爬上起重臂，安装拉杆。这时一处吊点的钢丝绳将起重臂2根侧向斜腹杆拉断，起重臂弹起后又瞬间落下，起吊钢丝绳崩断，起重臂砸向地面，起重臂上的5名工人4人死亡、1人重伤。
问题：
(1)请简要分析这起事故发生的主要原因。
(2)请分析这起事故的性质。谁应对这起事故负直接责任、主要责任和管理责任。
(3)请简述起重吊装作业专项施工方案应包括哪些主要内容。
(4)请简述起重吊装作业预防高处坠落事故的安全技术措施。