单项选择题女性,50岁。15年前因甲状腺功能亢进行甲状腺次全切除术。近1个月来又感心悸、出汗、消瘦,心电图检查提示心房颤动,心率120次/分,FT升高,FT升高。应首先考虑的治疗措施是
单项选择题Four years ago material X cost $5 per kg and the price index most appropriate to the cost of material X stood at 150.The same index now stands at 430. What is the best estimate of the current cost of material X per kg?