BH005蒸汽吹扫前，应先进行暖管，及时排水，并应检査管道（）。
A.动位移
B.热位移
C.冷位移
D.静位移
参考答案：B
His father has been trying to _____ his habit of playing video games all day. [ ]
A. cure
B. cure him
C. cure of
D. cure him of
《放射卫生技术服务机构资质证书》有效期为（）。
A.二年
B.三年
C.四年
D.五年
