题目内容
在数据库的如下两个表中，若学生成绩表的主键是学生号和课程名，学生表的主键是学生号。在下列所给的操作中，()操作不能执行。 学生成绩表 学生表
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破产宣告裁定作出后,人民法院应作出（)具体工作。A．发布公告,以便使破产债权人,破产债务人,其他利破产宣告裁定作出后,人民法院应作出()具体工作。
下列各项有关有害气体净化方法的选项不正确的是()。
听力原文：F: So, how are things going, Tom？
M: Well, to be honest, I was feeling great on Saturday, but I started to feel sick Sunday afternoon. 1 thought I'd get better, but I feel worse than before. And I'm really worried because I'm scheduled to give a presentation at work on Friday, so I have to be better by then.
F: Well, what seems to be the problem？
M: Well, I thought I had the flu, but the doctor said it was just a had cold. He gave mc some cold medicine to take care of my stuffy nose and fever. I'm supposed to take the medicine three times a day after eating, but it doesn't seem to help. He also told me to stay off my feet for day or so, but I'm so busy these days.
F: Listen, forget about that medicine! I have just the thing to get rid of bad colds. You see, my mom is really into herbal medicine.
M: Oh, no, thanks.
F: Ah, come one! Give it a try. You just make some of mom' s herbal tea and drink it four times a day. Believe mc. you'll be up and dancing around in no time
M: Dancing around in no time, right？ Well, I guess. Nothing else seems to be doing the job.
F: Great, I’ll come by your place at 7:30. see you then.
What' s the matter with the man？
密闭空间是指与外界相对隔离,进出口受限,自然通风不良,足够容纳一人进入并从事非常规、非连续作业的有限空间。并指出在职业活动中可能引起死亡、失去知觉、丧失逃生及自救能力、伤害或引起急性中毒的环境,不能有以下()情形。
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