问题
问答题 简答题
何为外压失稳,防止压力水管外压失稳的措施有哪些?
答案
参考答案:
管道内部产生真空或负压时,管壁在外部的大气压力下可能丧失稳定,管壁被压瘪的现象。钢管的外压稳定必须满足两个要求:
①在外压力作用下钢管本身不失稳;
②看外压承载能力满足要求。
防止措施:
1)在管壁上增加加劲环提高管壁的刚度;
2)增加管壁厚度;
3)锚筋与锁体。
何为外压失稳,防止压力水管外压失稳的措施有哪些?
参考答案:
管道内部产生真空或负压时,管壁在外部的大气压力下可能丧失稳定,管壁被压瘪的现象。钢管的外压稳定必须满足两个要求:
①在外压力作用下钢管本身不失稳;
②看外压承载能力满足要求。
防止措施:
1)在管壁上增加加劲环提高管壁的刚度;
2)增加管壁厚度;
3)锚筋与锁体。
补全对话 从方框中所给的选项中选择正确的句子补全以下对话。(10分) A: Morning! 小题1:_____________________ B: I’ve got a sore throat and a headache. A: Do you feel tired? B: Yes, my whole body feels weak. 小题2:_______________ A: I’m sorry to hear that, I’ll have to examine you. Open your mouth wide so that I can look at your throat. Yes. It’s very red. It looks sore. I’ll have to give you an injection. B: 小题3:___________________ A: An injection is better than pills. B: Are you sure? 小题4:____________ A: But you’d better have an injection first. It is more helpful. B: OK. 小题5:__________________ A: Probably, if you take a rest today. B: Good, I’ll sleep today so that I’ll be able to go out tomorrow.
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