UM7l型无绝缘轨道电路采用电气绝缘节以取代轨道电路中使用的机械绝缘节，来实现相邻轨道电路区段的（）
A. 邻线隔离
B. 相互隔离
C. 邻线脱离
D. 相互变换
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What is a global command?（）
A command that is available in every release of IOS, regardless of the version or deployment status.
B. A command that can be entered in any configuration mode.
C. A command that is universal in application and supports all protocols.
D. A command that is implemented in all foreign and domestic IOS version.
E. A command that is set once and affects the entire router.
In ballast means that the ship is（）.
A. loaded with cargo
B. in danger
C. not carrying cargo
D. discharging cargo
下列选项中，属于自清扫过滤器的是（）。
A. Y型过滤器
B. 直通过滤器
C. 旁通过滤器
D. 烧结过滤器
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