地面上同一点用重力仪实测的重力观测值与正常重力值间的偏差,成为()。
A. 重力均衡
B. 重力异常
C. 布格重力异常
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在氨区内确因工作需要动用明火或进行可能散发火花的作业,应办理“一级动火工作票”。动火作业前必须进行可燃气体测试,爆炸下限应低于多少百分之多少后方能准许动火?
It’s a configuration that experts are calling a "firewall sandwich," with the second firewall providinga second level of load balancing after traffic down. What is meant by the term "firewall sandwich"?()
A. single layer of firewalling
B. multiple layers of firewalling
C. firewall connections in either an active or standby state
D. an architecture in which all traffic between firewalls goes through application-specific server
两个以上公安消防支()队协同作战时,上级指挥员到达现场前,实施();上级指挥员到达现场后,应当实施直接指挥或者授权指挥。