当刀具上超过一定温度时,刀具材料的金相组织发生变化,硬度显著下降,从而使刀具迅速磨损,这种现象称为()磨损。
参考答案:相变
在生活中,我们经常会遇到一些令人不愉快的事情,应该如何处理呢?以下是网站www.fyv.com提供的几个问题及其解决方法,请你予以合理的配对。
Problems:
小题1:Some people always smoke in public places.
小题2:The No.1 bus is always late.
小题3:Some students always drop rubbish everywhere at school.
小题4:My parents ask me to go to after – class activities club all day, even on weekends.
小题5:Some children talk loudly in the bookstore.
A: Tell them politely to keep quiet.
B: Call the bus company and ask for the better service.
C: Hand out some posters to ask them not to litter.
D: Tell them that we need to relax after studying for a long time.
E: We could say politely, Excuse me! Would you mind not smoking here?
下列关于肝静脉的描述错误的是()
A.肝静脉包括肝左、中、右静脉
B.肝静脉包括肝左、中、右静脉,肝右后静脉和尾状叶静脉
C.肝左、中、右静脉出肝处称为第二肝门
D.肝右后下静脉和尾状叶静脉出肝处称为第三肝门
E.第二和第三肝门是相互移行的