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。()
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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
.SS7C型电力机车辅助电路中使用的6C型接触器,采用自身清理"通风"设计,可使尘埃从()排除。