用在LED灯具上的透镜怎么辨别好坏答:主要是看透光率和防眩光.用肉眼看的话不容易判断,但也能了解个大概.看透光率,用一个显眼颜色,通过透镜看,能够比较清楚的识别该颜色并其色彩总量跟没经过透镜看差不多的话,透光率就比较高.看防眩光,(当然,有的澄明透镜的话,不会有眩光要求). 同样,用一棱角分明物体,通过透镜看, 看的棱角越模糊,...
谁能帮我翻译成英文,急用,万分感谢,本人的分数很少,望谅解答:Body fat is an essential component, often exist in various forms, such as glycolipids and phospholipids in the brain and peripheral nerve cells and tissues. Fat may promote fat-soluble vitamin A, vitamin D, vitamin E, vitamin V and the absorption of carotenoids. In addition, a ...