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
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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。
乘数理论是一把“双刃剑”,增加需求导致国民收入成倍地增加,减少需求同样将导致国民收入成倍地减少。
A. 正确
B. 错误
What are two reasons that a network administrator would use access lists? (Choose two.) ()。
A. to control vty access into a router
B. to control broadcast traffic through a router
C. to filter traffic as it passes through a router
D. to filter traffic that originates from the router
E. to replace passwords as a line of defense against security incursions&e