【判断题】Spheroidizing is to improve the machinability of the annealed hypoeutectoid steel by producing a spheroidal or globular form of a carbide in a ferritic matrix which makes the machining easy.
【单选题】Researchers at Children' s Hospital of Pittsburgh announced they had discovered ______ evidence that a virus is involved in what used to be called juvenile diabetes.
【单选题】Western juries have traditionally found eyewitness testimony to be the most convincing evidence in criminal trials. Seeing is believing, as the saying goes. In numerous cases, when witnesses pointed t...
【单选题】Wilkins Micawber is a character in the novel ______ , an eternal optimist who, despite evidence to the contrary, continues to have faith that something will turn up.
【简答题】In a hypoeutectoid steel,both eutectoid and proeutectoid ferrite exist.Explain the different between them.What will be the carbon concentration in each.