减少和排除散射线的方法中,错误的是() A.缩小照射野减少散射线 B.用金属后背盖的 发布时间:2018-03-08 14:37 │ 来源:www.tikuol.com 题型:单项选择题 问题: 减少和排除散射线的方法中,错误的是()A.缩小照射野减少散射线B.用金属后背盖的暗盒减少散射线C.用遮线筒或缩光器来减少散射线D.选择高电压摄影的方法E.使用滤线栅法排除散射线
题型:单项选择题 —May I ask you a question after class, Mr. Lee? — ______________, but not during my lunch break.A.I’m sorryB.AnytimeC.CertainlyD.Go ahead 查看答案
题型:单项选择题 把下列各句翻译成汉语。 ①Stop arguing about procedure and get down to business. ______________________________________________________ ②Let's proceed to business. ______________________________________________________ ③He proceeded to inform me that everything was wrong with it. ______________________________________________________ 查看答案