Full annealing is accomplished by heating at a temperature approximately how many degrees celsius above either a3 line (for compositions less than the eutectoid) or a1 line (for compositions greater than the eutectoid)? 25°c 40°c 50°c 55°c 70°c g

Which sentences describe disadvantages of burning fossil fuels instead of using hydrogen fuel cells? burning fossil fuels contributes to climate change. burning fossil fuels takes place inside expensive fuel cells. fossil fuels aren't widely available, but pure hydrogen is. fossil fuels are nonrenewable.