问题
问答题 简答题
汽轮机的寿命指的是什么?
答案
参考答案:
在高温下长期运行的汽轮机,其零部件的材料性能发生很大的变化,使其强度下降,以致出现裂纹。汽轮机的寿命是指从初次投入运行,至转子出现第一条宏观裂纹期间的总工作时间。对于宏观裂纹的尺寸尚无统一规定,一般认为宏观裂纹长度为0.2~0.5mm。
汽轮机的寿命指的是什么?
参考答案:
在高温下长期运行的汽轮机,其零部件的材料性能发生很大的变化,使其强度下降,以致出现裂纹。汽轮机的寿命是指从初次投入运行,至转子出现第一条宏观裂纹期间的总工作时间。对于宏观裂纹的尺寸尚无统一规定,一般认为宏观裂纹长度为0.2~0.5mm。
Complete the following passage with the words or phrases in the box. Each word can only be used once(将下列单词或词组填入空格, 每空格限填一词,每词只能填一次。):(共8分)
The police began to __小题2:__ the girls, aged 14 and 15. They are students at Melbourne School and were in the area as part of a school camp. The girls were last seen at about 4:30 pm yesterday and did not return for dinner at 6 pm. “They were ___小题3:___ to be wearing lightweight clothing. It has rained in the area for three days and the police are worried about their __小题4:__. Search and Rescue police will arrive in the area immediately to coordinate(协调)a full-scale search,” said the spokeswoman. |