问题
判断题
用户申请改为高一级电压供电,其改压引起的工程费用应由用户负担。()
答案
参考答案:对
用户申请改为高一级电压供电,其改压引起的工程费用应由用户负担。()
参考答案:对
阅读下列短文并根据所读内容在文章后表格中的空格里填入最恰当的单词,每空格1词(共10个小题;每小题1分,满分10分) Zebras have their own bug repellent(驱虫剂)? Eww bugs! They are so annoying! We humans are lucky that we can apply repellents to avoid nasty bites. But what’s an animal to do? They have no choice but to spend their days shooing them off with their tails, unless, of course, they are zebras, who apparently have their own automatic repellent--- their striped skin! Scientists had originally thought that the reason why the animal had developed the black and white lines was to help protect itself from predators in the African savannah, because the stripes make it difficult to single out one zebra that is traveling with a herd.While that may be true, the theory has never been tested or proven. Now the experts have another---that the stripes have evolved to repel the annoying horse flies that not only feed off their blood, but also, transmit dangerous germs into the bodies of these innocent animals. The study was performed by a team of Swedish scientists. One of the clues that got them thinking along these lines was the fact that darker horses got bitten more often than light-colored or white ones. The fact that zebras are born black and only develop strips as they grow older made the scientists theorize that the stripes may be something the animals have developed to make themselves less attractive to flies. To test if this may be the case, they painted some boards at a horse-infested horse farm in Budapest with patterns of black and white stripes of varying widths and applied a layer of glue on them. What they noticed was that the places where the black and white stripes were at their narrowest (similar to what zebras have) attracted the fewest flies. They achieved similar results when they painted horses with black and white zebra-like stripes. While the research are not sure why this may be the case, they believe it may be something to do with the way insects operate---horseflies are attracted to horizontally polarized light(偏振光); since white does not reflect it, white horses are luckier than black ones. But zebras seem to be the luckiest of all. When the researchers measured the polarized light reflected from real zebra skins, they found that it matched light patterns that were the least attractive to horseflies. While this theory does make logical sense, nobody is 100 percent sure that it is really true, given that it has never been tested on a real zebra. If it is true, it does raise the question of why a horse, a close relative of the zebra has failed to develop stripes. The researchers believe that this could be because there are more horseflies in Africa, where zebras reside, then anywhere else in the world.
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南方电子电气有限公司(建设单位)新建液晶屏(1-CD)生产车间,其生产线由建设单位从国外订购,A施工单位承包安装。A施工单位进场时,生产车间的土建工程和机电配套工程(B施工单位承建)已基本完工。A施工单位按合同工期要求,与建设单位、生产线供应商和B施工单位洽谈,编制了LCD生产线安装网络计划工作的逻辑关系及工作持续时间表(见表2-1)。
LCD生产线安装网络计划工作逻辑关系及持续时间
工作内容 | 工作代号 | 紧前工作 | 持续时间/天 |
进场施工生产进场 | A | - | 20 |
开工后生产线进场 | B | - | 60 |
基础检测验收 | C | A | 10 |
配电装置及线路安装 | D | A | 30 |
LCD生产线组装固定 | E | BC | 75 |
配套设备及电器控制系统安装 | F | BC | 40 |
LCD生产线试车调整 | G | DE | 30 |
电器控制系统检测 | H | DEF | 25 |
联动调试、试运行、验收 | I | GH | 15 |
按LCD生产线安装网络计划工作的逻辑关系及工作持续时间表为A施工单位项目部绘出安装进度双代号网络计划图。 |