【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.
【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.