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20套自行车散件(无车座)装于一个木箱内，40个车座装于一个木箱内，同时进口

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It is useful to remember that history is to the nation as memory is to the individual. As persons deprived of memory become disoriented and lost, not knowing where they have been and where they are going, so a nation denied a conception of the past will be disabled in dealing with its present and its future.
History is the best antidote to delusions of omnipotence and omniscience. (52) Self-knowledge is the indispensable prelude to self-control, for the nation as well as for individual. History should forever remind us of the limits of our passing perspectives. It should strengthen us to resist the pressure to convert momentary impulses into moral absolutes. It should lead us to recognition of the fact, so often and so sadly displayed, that the future outwits all our certitudes and that the possibilities of the future are more various than the human intellect is designed to conceive.
(53) A nation informed by a vivid understanding of the ironies of history is best equipped to manage the tragic temptations of military power. Let us not bully our way through life, but let a sensitivity to history temper and civilize our use of power. In the meantime, let a thousand historical flowers bloom. (54) History is never a closed book or a final verdict. It is forever in the interests of an ideology, a religion, a race, and a nation.
The great strength of history is its capacity for self-correction. This is the endless excitement of historical writing: the search to reconstruct what went before. (55) A nation's history must be both the guide and the domain not so much of its historians as its citizens.
(31)

在“学生.mdb”数据库中有教师、课程、授课、课程成绩、系别、班级和学生表。
(1)以班级表和学生表为数据源，创建参数查询“班级信息”，实现创建输入班级ID，显示班级学生信息。参数提示为“请输入班级ID”，结果显示班级名称、学号和学生姓名字段。查询结果如图所示。

试分析支撑线和压力线起作用的原因，并对这一过程进行简要论述。

试述真理的绝对性和相对性的辩证关系,并用这一原理阐明如何坚持和发展马克思主义。