The thief was brought in, his hands ____________ behind his back. [ ]

A. tying        

B. tied          

C. being tied        

D. having tied

下列关于焊接施工安全规定，错误的是（）

A.密闭空间焊接作业应设置通风、绝缘、照明装置和应急救援装备

B.密闭空间焊接作业应设专人监护，金属容器内照明设备的电压不得超过12V

C.高处电焊、气割作业，作业区周围和下方应采取防火措施

D.雨天露天电焊作业应穿雨衣