遇有危及（）安全的紧急情况，可以不经电力调度批准，先行断开断路器或有条件断开的负荷开关、隔离开关，并立即报告电力调度。
参考答案：人身和设备
工程项目费用控制的依据主要有（）。
A．工程项目的费用计划(预算)
B．进度报告
C．WBS
D．范围说明书
E．施工组织设计
Applications put computers to practical business (67) , but below the (68) it’s the heart of an operating system-the kernel-that provides the technical wizardry to juggle multiple program, connect to networks and store (69) . A traditional kernel provides all the functions for applications. The kernel (70) memory, I/0 devices and parcels out processor time. The kernel also supports security and fault (71) , which is the ability to recover automatically when parts of the system fail.
A．earth
B．bottom
C．table
D．surface
