本文对罗建成发表的“也谈三膨胀源膨胀剂”一文中提出的质疑,给与正面答复。对于第三膨胀源MgO的实际作用给与说明,并提出高钙膨胀剂是发展新方向。 This article gives a positive reply to the question raised by Luo Jiancheng in his article entitled “Three Expansion Sources Expansion Agent”. For the third expansion source MgO the actual role given instructions, and proposed high calcium expansion agent is the development of new directions.