A phenomenon where a changing magnetic field can produce an electric current in a conductor. What is this called? A. Gravity induction B. Magnetic induction C. Electric induction D. Friction induction 相关知识点: 试题来源: 解析 B。解析:磁生电的现象被称为电磁感应,也就是变化的磁场能在导体中...
In the betatron, a changing magnetic field produces an electric field that accelerates electrons to relativistic speeds. In the synchrotron, both radio-frequency and time-varying magnetic field are used. 在直线加速器中,离子在一排线形管道间隙中被逐次加速。在回旋加速器中,离子同样被加速但是由于应用了...
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Hazel Technologies, a Chicago - based startup that created a small drop - in packet to keep banans and other produce from turning prematurely brown, is starting to produce a lot of green. Having raised 70 million in a completed investment round, the 6 - year - old company aims to launch...
The OGarden Smart will set you back $859 Canadian dollars (about $650 USD) if you order it on Kickstarter at a discounted rate, but the company's founders are quick to point out that it will help you save money in the long-run. The system lets you grow organic (有机的) produce at...
(2) electric field strength(3) electric potential difference(4) electric resistance5 A machine launches a tennis ball at an angle of25° above the horizontal at a speed of 14 metersper second.The ball returns to level ground.Which combination of changes must produce anincrease in time of ...
Eating within 90 minutes of waking up will jump﹣start your metabolism(新陈代谢)and keep you from getting hungry later. (2) F 2. Be boring. Changing what you eat is a good idea in theory,but if you are watching your weight,you might want to stick with the same old menu...
Many of these genes produce proteins (蛋白质) that can improve blood sugar regulation and insulin (胰岛素) levels throughout the body and so are associated with improved metabolic health. These genes were much more active when the men had fasted before exercise than when they had breakfasted. ...
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