如图,在△ABC中,AB=BC,在BC上分别取点M、N,使MN=NA,若∠BAM=∠NAC,则∠MAC=____°.
Ca3(PO4)2+SiO2+C →高温 CaSiO3+P4↑+CO↑
Have you ever listened to the song Yesterday Once More, ________ singer died in her early years?