【简答题】在 NetBar 的数据库表 Card 中,为字段 ID 增加约束,要求 ID 字段的格式限制为: l 只能是八位字节。 l 前两位是 0 。 l 3-4 位为数字。 l 第 5 位为下划线。 l 6-8 位为字母。 为 NetBar 的数据库表 Card 增加以下数据行,如图 3.3 所示。 ID Password Balance UserName 0023_ABC A bc 100 00...
【单选题】Juia; It’s nearly eight. If you want to catch the last train, you'd better go now. Bill: Don' t worry. I’ll drive to the station. Juia: In that case, let me go with you. And you drop me off at the cit...
【单选题】Julia: It's nearly eight. If you want to catch the last train, you'd better go now. Bill: Don't worry. I'll drive to the station. Julia: In that case, let me go with you. And you drop me off at the ci...
【简答题】Directions: Each of the following sentences has a mistake in it. Identify the unnecessary word in each sentence. Dealing with communication breakdown Asking for repetition 1. Sorry, I didn’t quite cat...
【简答题】用适当的连词完成下列句子,每小题 2 分。 1. I hardly knew anything about it ( ) you told me. 2. Study hard,( ) you won't catch up with your friends. 3. Tom went to visit his friend ( ) is a teacher. 4. My gr...