影响水泥安定性的主要因素是游离氧化钙和方镁石结晶。
参考答案:对
Don't forget _____ the medicine before you go to bed.[ ]
A. take
B. taking
C. to take
D. took
举之无力,按之空虚的脉象是()浮大中空,如按葱管的脉象是()
A.浮脉
B.微脉
C.革脉
D.虚脉
E.散脉