orstocks. When shot, an arrow, orbolt, traveled down a groove or through a notch in the tiller. Both styles also incorporated devices to make drawing the string easier. One common device was astirrupat the front of the crossbow.
When gunpowder was used to create personal handguns and rifles, a new type of soldier was created: infantry. Photo shows a Revolutionary War reenactment at Fort Ward Historic Site in Alexandria, Virginia. (Image credit: Igor Vorobyov, Dreamstime) Each Monday, this column turns a page in ...
Rail guns leave gunpowder-based weapons in the dust (one can hit a target 250 miles away in six minutes). So why isn't the military using them? Find out how rail guns can be used and learn about the limitations of this technology.
A. By using gunpowder. B. By flooding the rocks with water. C. By applying a heating and cooling technique。 D. By breaking the rocks with hammers and spades. 相关知识点: 试题来源: 解析 C 解析:细节理解题。根据倒数第二段倒数第二句“He used a combination of fire and water to heat ...
A. By using gunpowder. B. By flooding the rocks with water. C. By applying a heating and cooling technique. D. By breaking the rocks with hammers and spades. 相关知识点: 试题来源: 解析 C 答案C 解析 细节理解题。根据第四段第三句“He used a combination of fire and water to heat and...
A. By using gunpowder. B. By flooding the rocks with water. C. By applying a heating and cooling technique. D. By breaking the rocks with hammers and spades. 相关知识点: 试题来源: 解析 C 解析:细节理解题。由倒数第二段He used a combination of fire and water to heat and cool the ro...
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You might wonder how a human cannonball can survive the act unscathed by gunpowder burns. The fact is, there's actually no gunpowder used in these big cannons (and, historically, never has been), which can be more than 30 feet (9 meters) long [source: American Profile]. Instead, modern...
A worm called Storm, which showed up in 2007, immediately started making a name for itself. Storm used social engineering techniques to trick users into loading the worm on their computers. And boy, was it effective -- experts believe between 1 million and 50 million computers have been infec...
Soon after this sort of weaponry came into use, it was eclipsed by another pyrotechnic technology: gunpowder. Over the next thousand years, gunpowder revolutionized the world of warfare, and flamethrowers more or less fell by the wayside. But as we'll see in the next section, flamethrowers ...