在渗透探伤法中,若工件表面比较粗糙,应选择水洗性荧光渗透探伤法和水洗性着色渗透探伤。
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盐井完成是钻井工程的最后一个重要环节,主要包括()与();()和();()和()等。
Which statement about immersion suits is TRUE?()
A. The primary color of the suit's exterior may be red,orange or yellow
B. The suit must,without assistance,turn an unconscious person's mouth clear of the water within 5 seconds
C. The suit is flameproof and provides protection to a wearer swimming in burning oil
D. The suit may be stored in a machinery space where the ambient temperature is 160°F
使用磁轭法时,探伤区域应限制在两磁极连线的两侧相当于下述之磁极间距的面积范围内()。
A. 1/2的磁极间距
B. 1/3的磁极间距
C. 1/4的磁极间距
D. 3/4的磁极间距