【单选题】听力原文： I'd like to share with you today my experience with a new approach to building a house．It's called Envelop Building．Essentially, what it means is that as you are building a house, you try to lea...
M: A card for six months is six pounds. W: So how do I get one? M: You need two photographs — one for the card and one for the form. W: There's a photo machine in the post office. It gives you four photos for three pounds. M: So does the one in the library. Bu...
在无法对元件的功能作出正确判断 时， 一个通用的办法是更换一个确认功能 正常的元件，观察系统的工作状况。