High-speed trains travel at 300 kilometers an hour, which is about __________ normal trains. A: four times the speed as B: the speed four times of C: four times as the speed of D: four times the speed of

Given the following output：  A:  The speed of the slowest interface in the port channel B:  The combined speed of all interfaces configured in the port channel C:  The combined speed of all interfaces in the port channel that are up D:  The speed that can be achieved if all buffers are used

speed brake

________ will also be a very important factor when determining the speed of access of a particular user. A: The speed of the system B: The speed of the internet facility C: The platform dependency D: The demanding quality

Which of the following is a possible cause of the event "the high speed train is underdeveloped in the US"? A: Americans don't like the high speed train. B: Highway network is advanced. C: The geography is unsuitable for the high speed train. D: The high speed train damages environment.

中国大学MOOC: Two spaceships move with same speed 0.80c relative to the Earth, but in opposite directions. What is the speed of one ship relative to the other? (c is the speed of light in vacuum)

As a block slides down a frictionless incline, which of the following statements is true? A: Both its speed and acceleration increase. B: Its speed and acceleration remain constant. C: Its speed increases and its acceleration remains constant. D: Both its speed and acceleration decrease. E: Its speed increases and its acceleration decreases. F: None of these.

Every vessel should at all times proceed at a safe speed. Safe speed is defined as that speed where ____.

中国大学MOOC: On August 1st, 2008, China’s first high speed railway, Beijing-Tianjin Intercity High Speed Railway was put into use, marking the beginning of the high speed era.

High Speed Railway