2x2•(-x)=______.
原式=-2x3.
故答案为:-2x3
Who would you rather ______ with the teacher about the problem?
A.talking
B.have talk
C.have talked
D.talk
控制破伤风患者痉挛发作最主要的措施是()
A.鼻饲饮食
B.保持环境安静
C.避免强光照射
D.按时使用镇静剂
E.静脉滴注破伤风抗毒素