| To us it seems so natural to put up an
umbrella to keep the water off when it rains. But actually the umbrella was not
invented as protection against rain. Its first use was as a shade against the
sun. Nobody knows who first invented it, but the umbrella was used in very ancient times. Probably the first to use it were the Chinese, way back in the eleventh century B.C. We know that the umbrella was used in ancient Egypt and Babylon as a sunshade. And there was a strange thing connected with its use: it became a symbol of honor and authority. In the Far East in ancient times, the umbrella was allowed to be used only by royalty or by those in high office. In Europe, the Greeks were the first to use the umbrella as a sunshade. And the umbrella was in common use in ancient Greece. But it is believed that the first persons A. The Invention of Umbrella. B. The History of Umbrella. C. Umbrella — A Symbol of Honor. D. Who Used Umbrella First [单选题]某城市计划对本地城市建设进行全面规划，根据《环境保护法》的规定，下列城乡建设行为不符合《环境保护法》规定的是（ ）。
A.加强在自然景观中修建人文景观 B.有效保护植被、水域 C.加强城市园林、绿地园林 D.加强风景名胜区的建设 [单选题]下列关于铅的说法错误的是：
A.铅笔芯的主要成分是铅 B.香烟中是含铅的 C.铅在人体内日积月累，不会分解 D.汽油中添加铅元素可以起到防爆的作用 [单选题]孔隙性地层含油岩屑富含油级别，含油岩屑占定名岩屑岩性（ ）%。
A.>35， B.<50， C.>40， D.>50 [单项选择]施工方案变更要经（）的批准。
A. 业主 B. 施工企业 C. 监理工程师 D. 承包单位 [简答题] 线路、道岔经常保养基本内容。
[多选题] 如何让无线网络达到最佳性能?( )
A.将无线路由终端远离变压器、日光灯、微波炉、冰箱等设备。 B.更改无线路由终端无线加密方式。 C.申请更高速率带宽。 D.若有金属、混凝土、墙壁或者地板阻挡传输路径,可能会导致无线信号减弱或者消失,将无线路由终端放置在开放的空间,以便改善覆盖区域。 我来回答: 提交
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