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Howsoever sturdy and robust it may be, a submarine, at the end of the day, is still just a machine. It has a number of systems of different types – electrical, mechanical, electronic, hydraulic etc. – that make it work underwater. At times, some of these systems have problems that ...
根据文章开头的“Here’s how to make a model submarine(潜水艇) that dives(潜水) and comes up from underwater like a real one.”可知这是制作能潜水并从水下像真实潜艇一样上来的模型潜艇的方法。故选B。 (2)题详解: 细节理解题。根据“You’ll need”部分可知需要“Plastic bottle, Tape(胶), ...
Here’s how to make a model submarine(潜水艇)that dives(潜水)and comes up from underwater like a real one. You’ll need •Plastic bottle •Tape(胶带)•Four coins •Thin rubber or plastic tube(管子)•Waterproof(防水的)modelingclay(黏土)—not real clay, which dissolves(溶解)in ...
Where this ride stops nobody knows, but at a certain point, submarines could start looking like underwater aircraft carriers. Equipping submarines to operate unmanned aircraft is not without risk. The submarine must rise to periscope depth to communicate with the drone, and in the process of ...
Ships and boats are made to float on top of the water, but there are quite a few things that can go wrong to turn your boat into a submarine. Taking on water is inevitable -- large waves often break over the sides, and tiny leaks are common. This water will usually find its way ...
作者: M Martella 摘要: The best way to determine the speed of vessels with fixed propellers is to measure the speed of the propeller shaft, which is coupled to the engine. International Marine Systems, USA, wraps magnetic tape around the shaft's circumference and then installs a magnetic ...
The projectile, under the influence of the Lorentz force, accelerates to the end of the rails opposite the power supply and exits through an aperture. The circuit is broken, which ends the flow of current. Usurping Power Rail guns require tremendous currents to fire projectiles at speeds of ...
How does a ship stay afloat on water?Density:In science, density is the ratio of the mass to the volume. For an object having irregular shape, we can solve its density by taking its mass by weighing and dividing by the local gravity. Then to measure its volume, we can submerge the ...