题目内容
按制定软件工程标准的不同层次和适用范围，软件工程标准可分为5级， (1) 制定的是国际标准， (2) 是行业标准。GB1256-89对程序流程图等做了明确、具体的规定，这种标准程序流程图的特点有 (3) 、 (4) 和 (5) 。 1（）
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M: What are you looking forW: We’re studying the basic structure of molecules.M: Just any molecules There are quite a few of them!W: Yes, far too many. We’re only working with certain molecules that contain carbon and hydrogen.M: What do you expect to learn from thatW: We’re trying to see the kinds of carbon molecules in which we can use silicon as a substitute.M: What difference would that makeW: Silicon has a lot of the same properties as carbon, hut it’s much more common than carbon.M: Oh, I see. What is the woman studying().
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