A. Trains. 1. **选项分析** - **A. Trains(火车)**:在汽车交通信号灯出现之前,铁路已经使用信号系统(如机械臂信号灯、灯光信号)来管理火车行驶,确保轨道安全。铁路信号技术的应用远早于汽车普及(19世纪中期至末期的铁路 vs 20世纪初的汽车交通灯)。 - **B. Boats(船只)**:船只使用灯号、旗语等信号
5. What does the text mainly tell us?A. How important traffic lights are.B. Which colour has the longest wavelength.C. What red, yellow and green can be used for.D. Why traffic lights are red, yellow and green. 相关知识点:
is served by the layer below it. So, in a given message between users, there is a flow of data down through the layers in the source computer, across the network and then up through the layers in the receiving computer. Only the application layer at the top of the stack doesn't provi...
like remembering a sequence of directions while driving. Why does the tussle between two simultaneously active language systems improve these aspects of cognition? Until recently, researchers thought the bilingual advantage stemmed primarily from ability for inhibition that was honed by the exercise of ...
The DNS resolver is the first stop in the DNS lookup, and it is responsible for dealing with the client that made the initial request. The resolver starts the sequence of queries that ultimately leads to a URL being translated into the necessary IP address. ...
根据第一段 “If you will be cycling, you will need to know what these traffic signs and signals mean." 知,文章主要是写给骑自行车的人的,故选C。 2.细节理解题。 根据第二段 “If there is a bike lane, you are required to use it."可知, 如果有自行车道, 骑自行车的人 必须走自行车道,故...
The cyclist will help other vehicles move faster D. The cyclist will be praised by other road users 相关知识点: 试题来源: 解析 B。解析:交通信号灯是为了规范所有交通参与者的行为。自行车手不遵守交通信号灯,就会破坏正常的交通秩序,比如在车辆正常行驶的时候突然闯入道路,这很可能使自己陷入危险之中,...
What Is Wi-Fi 6? Wi-Fi 6 is short for the next-generation 802.11ax standard. With the evolution of Wi-Fi standards, Wi-Fi Alliance (WFA) renames Wi-Fi standards using sequence numbers to help Wi-Fi users and device vendors easily learn about their connected and supported Wi-Fi device...
What is the Error “ERR_TOO_MANY_REDIRECTS”? How do different browsers display the ”’ERR_TOO_MANY_REDIRECTS”? What are the common causes of the Error “ERR_TOO_MANY_REDIRECTS”? What are the fixes for the general causes of the “ERR_TOO_MANY REDIRECTS” error? How to fix the erro...
The Transport Layer ensures that data reaches its intended destination reliably and in the correct sequence. To achieve this, it assigns a source port and a destination port to each data segment, creating what is known as a “socket.” Sockets—represented as a combination of IP address, ...