问题
单项选择题
汽轮机向上拱起的热变形的一般原因是（）。
A、汽缸内、外壁温差；
B、汽缸上、下壁温差；
C、汽缸法兰内、外壁的温差；
D、法兰螺栓加热装置投入不当。
答案
参考答案：C
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汽轮机向上拱起的热变形的一般原因是（）。
A、汽缸内、外壁温差；
B、汽缸上、下壁温差；
C、汽缸法兰内、外壁的温差；
D、法兰螺栓加热装置投入不当。
参考答案：C
完形填空（共15小题, 每小题1分， 满分15分） 阅读下面的短文，从短文所给的A、B、C、D四个选项中，选出可以填入空白处的最佳答案。 For years we have been told that encouraging a child’s self-respect is important to his or her success in life.__41__ child experts are now learning that __42__ praise can lead to the opposite effect. Praise-aholic(受表扬上瘾的) kids who __43__ it at every turn may become teens who try to get the same kind of __44__ from friends when asked if they want to go in the backseat of the car. The meaning of saying “You are the __45__ girl in class,” or talking about the goals she scored but not her general __46__, is that you love her __47__ when she looks the best, scores the highest, achieves the most. And this __48__ over to the classroom. Social psychologist Carrol Dweck, PhD, tested the effects of overpraise on 400 fifth graders __49__ she was at Columbia University. She found that the kids who were __50__ for “trying hard” did better on tests and were more likely to take on difficult tasks than __51__ praised for being “smart”. “Praising qualities or abilities leads to a false __52__ that success will come to you because you __53__ that quality, and it devalues(贬值) effort. __54__, children are afraid to take on challenges, ” says Dweck, now at Stanford University, “They think they’d better __55__while they’re ahead.” 小题1:
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