题干

请从下列材料原文中摘抄出涉及物理知识的内容 ,并写出相应的物理知识或规律 ,至少写三条 ,不得与示例重复。

港珠澳大桥是迄今世界最长的跨海大桥 ,如图所示 ,总长55公里 ,两 边有长长的引桥,其中海中隧道 6.7公里(40米深 )。建造隧道时 ,将沉管两端密封 ,如同一个巨大的长方体空心箱子,然后让其漂浮在海面上,排水量为75000吨 ,再用船将密封沉管拖到预定海面上,向其内部灌水使之沉入海底在 ⒛18年央视春晚上,由百度Apollo无人车组成的百余车辆 ,成 为首批跑上港珠澳大桥的车队,在无人驾驶模式下完成“8”字交叉跑等动作,300架无人机跃过港珠澳大桥上空 ,近百艘无人艇穿过大桥。

上一题 下一题 0.0难度 选择题 更新时间:2018-11-28 02:57:43

答案(点此获取答案解析)


材料原文

物理知识或规律

同类题2

阅读理解

    26-year-old Anna Cherdantseva, from the city of Ufa in Russia, is a full-time employee of a furniture company, spending up t0 10 hours every day trying out new sofas for comfort and safety.

    Last month, Russian furniture giant M25 Group announced that it was taking application for a new position. Although all new products are tested in a specialized laboratory, management decided that in order to better meet the needs of consumers it needed some feedback(反馈) on real-life use of its sofas.  In just a few days, M25 received over 5,000 job applications.

    "We selected candidates in several stages," M25 Group spokesperson Anastasia Russkih said.  "Initially we checked their CVs, and then we let them tell us why they wanted the job. " Eventually, the furniture company shortlisted just 7 candidates, out of which Anna Cherdantseva, a 26-year-old marketing expert, proved to be the most suitable for the job.  "It was a real fight for my dream job," Anna said after getting selected.

    Despite describing herself as an active person, Cherdantseva says that spending about l0 hours a day sitting on sofas doesn't sound bad at all.  "Of course I will spend a lot of time on new sofas.  The more time I spend on them, the better it will be for my work," she told reporters.

    Anna Cherdantseva is at present on a three-month probation(试用期) at M25, but the company claims that as long as she proves to be up to the task, they plan on offering her a permanent position The young woman will receive a monthly salary of 56,000 rubles( $l,000) for the first three months.  It's not so bad for sitting on the job.