【单选题】Which of the following hypotheses about the relation-ship between the temperature and the density of a solidis best supported by the data in Figure 2 ? As the tem-perature of a solid increases, the de...
【简答题】Questions& Answer 1. Briefly explain the procedure of casting? 2. What is the difference in composition between steel and cast iron? 3.Why is the transformation rate zero when the temperature of auste...