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变压器、油断路器发生事故，有冒油、冒烟或外壳过热现象时，应（）。

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三态门除了“1”态、“0”态，还有第三种状态（）。

目前快件的收寄、处理、派送过程中的搬运装卸工作已全部实现自动化。

A. 正确
B. 错误

Sun Stable is a global insurance company with headquarters located in Houston， Texas. Thecampus there is made up of a number of office buildings located within the same vicinity. In 2003，a new building. Building 331B was added. The additional building houses approximately 1000 employees. Ratherthan deploy a private branch exchange （PBX） in the new building， Sun Stable has decided toimplement an IP telephony solution. External calls will be carried across a MAN link to anotherbuilding， where a gateway connects into the worldwide PBX network of Sun Stable. Voice mail andunified messaging components are required and all IP phones and workstations should be on separate VLANs and IP subnets. ActualTests.comWhich IP telephony deployment best suits their need？（）

A. single-site
B. multisite with centralized call processing
C. multisite with distributed call processing
D. clustering over the WAN

峰下制动员要尽量缩小（），钩钩到位，避免机车下峰顶送或变更计划。

A. 钩距
B. 天窗
C. 调车程
D. 保安间隔