题目内容
支架上现浇预应力混凝土连续梁的技术要求和注意事项有（)。A．支架稳定，强度、刚度的要求应符合规范支架上现浇预应力混凝土连续梁的技术要求和注意事项有()。
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注浆用砂浆配合比中，水泥：砂宜为1:1～1:2，水灰比宜为0.38～0.45。 ()
设有如下图所示的两个关系S(sno，sname，Sex)和SC(sno，cno，grade)。其中关系S的主码是sno，关系SC的主码是(sno，cno)。且关系SC的属性"sno"是它的外码。要求 grade的取值只能是0～100之间的整数。关系S
关系数据库必须满足以下3类完整性规则：
Ⅰ．实体完整性规则
Ⅱ．参照完整性规则
Ⅲ．用户定义的完整性规则
上述两个关系违背了哪个(些)完整性规则？
听力原文：M: What do you mean by a friend, Jean？
W: Oh, Robert, to me, friendship is the most important thing in life. It's more important even than love. If you love someone, you can always fall out of love again, and that can lead to a lot of hurt feelings, bitterness, and so on. But a good friend is a friend for life.
M: Someone who likes the same things that you do, who can argue with and not lose your temper, even if you don't always agree about things. I mean someone who you don't have to talk to all the time but can be silent with, perhaps. That's important, too. You can just sit together and not say very much sometimes. Just relax. I don't like people who talk all the time.
W: Are you very good at keeping in touch with your friends if you don't see them regularly？
M: No, not always. I've lived in lots of places, and, to be honest, once I move away, I often do drift out of touch with my friends. And I'm not a very good letter writer, either. Never have been. But I know that if I saw those friends again, if I ever moved back to the same place, or for stone other mason we got back into close contact again, I'm sure the friendship would be just as strong as it was before.
W: Several of my friends have moved away, got married, things like that. One of my friends has had a baby recently, and I'll admit I don't see her or hear from her as much as I used to...She lives in another neighborhood and when I phone her, she always seems busy. But that's an exception. I write a lot of letters to my friends and get a lot of letters from them. I have a friend I went to school with and ten years ago she emigrated to Canada, but she still writes to me every month, and I write to her just as often.
(23)
A．House painter.B．Salesman.C．Mailman.D．Milkman.
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