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
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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
模板工程必须经过支撑杆的设计计算,并绘制模板施工图,制订相应的施工安全技术措施。()
A. 正确
B. 错误
烧结过程的标志是坯体的强度增加、()、表面积减小,而不是指烧结体发生致密化或者收缩。