单项选择题Class discussions next week will _____________ the importance of love, communication and a close relationship between parents and their children. A. revolve in B. revolve with C. revolve around D. revolve on
单项选择题绘制铸造工艺图时，选择浇注位置的出发点是保证铸件的质量，而选择分型面的出发点是在保证铸件质量的前提下简化造型工艺。（ ） A. 对 B. 错
