钨极氩弧焊的有害因素是什么？
参考答案：
钨极氩弧焊的有害因素有三个方面：（1）放射性（2）高频电磁场（3）有害气体—臭氧和氮氧化物
关于治疗胎漏、胎动不安的常用方是
A．当归散
B．保阴煎
C．脱花煎
D．胎元饮
E．寿胎丸
John Smith has a blog at The Lonely Planet Times, and you can listen to a live audio stream by clicking this link below.
A. steam B. water flow C. recording D. programming
