【简答题】什么是实体?在E-R图中用什么图形表示?什么是属性?在E-R图中用什么图形表示?
【单选题】We know that 80 of the cases of blindness can .
【判断题】放学后,应该尽快整理好自己的书包和衣服回家,以免家人担心。
【简答题】在E-R图中用 表示实体;用 表示联系; 用 表示属性;这些要素间使 用 连接起来。
【多选题】在E-R图中,用 表示实体,用菱形表示联系,用椭圆表示 。
【简答题】在 E-R 图中,实体使用 图形来表示,联系使用 图形来表示 。
【单选题】—Don't you go to school by bike? —________. I walk to school every day.
【简答题】I get off the bus and walk a few blocks. I stop when I get to a garage-like place and walk to the metal door with brown paint. I turn the knob(把手)and walk in. A thousand eyes look at me as I take my p...
【单选题】—You know that you were driving at 100 kilometers per hour, don’t you? —No, officer, I _____ have been. This car can’t do more than 80.
【单选题】Only thirty per cent of ______ parents say that they know what their children like to do after _____ school.