| If we were asked exactly what we were
doing a year ago, we should probably have to say that we could not remember. But
if we had kept a book and had written on it an aceount(记录) of what we did each
day, we should be able to give an answer to the question. It is the same in history. Many things have been forgotten because we do not have any written account of them. Sometimes people did keep a record of the most important happenings in their country, but often it was destroyed by fire or in a war. Sometimes there was never written record at all because the people of that time and place did not know how to write. For example, we know a good deal about the people who lived in China 4000 years ago, because they could write and leave written records for those who lived after them. But we know almost no A. history based on a person’s imagination B. stories of important happenings passed down from mouth to mouth C. songs and dances about the most important events D. both B and C [简答题]飑线的基本特征及其与冰雹的关系如何？
[单项选择]在需氧条件下，以下不属垃圾填埋中有机物质无机化产生的最终产物是（）
A. 硝酸盐 B. 水 C. 甲烷 D. 硫酸盐 E. 二氧化碳 [判断题]钢轨顶面掉块长大于50mm，深大于10mm，属钢轨折断。
A.正确 B.错误 [多选题]进入浓烟、高温、有毒等危险区域侦察时，侦察人员要（），必须使用水枪进行掩护。
A. 多路线同时开展 B.正确选择侦察路线 C.确定撤离方式 D.明确联络信号 [单选题]DDU的含义为（ ）。
A.信号屏 B.司机显示单元 C.多媒体屏 D.人机界面 [单选题]有关单位和人员应当按照合同约定履行义务，监督相对方履约情况，确保合同正常履行，相对方存在（ ）的，应当积极主动维护公司合法权益。
A.违约行为 B.违法行为 C.投诉行为 D.言行不一行为 [单选题]单侧电源线路的自动重合闸装置必须在故障切除后，经一定时间间隔才允许发出合闸脉冲，这是因为( )。
A.需与保护配合 B.故障点要有足够的去游离时间以及断路器及传动机构的准备再次动作时间 C.)防止多次重合 D.断路器消弧 我来回答: 提交
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