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硬横梁安装应呈水平状态，其安装高度应符合设计，误差不超过（）mm。

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《铁路旅客运输办理细则》发售学生票时：超过减价优待证上记载的区间乘车时，对超过区间按一般旅客办理，核收全价。

A. 正确
B. 错误

Routers R1 and R2 are OSPF neighbors using their Fa0/0 interfaces, respectively, using default settings for all timers. An engineer ad ds the ip ospf hello - interval 6 command to R1's Fa0/0 configuration. Which of the following is true regarding the results from this change?（）

A. The show ip ospf neighbor command on R1 lists the revised Hello timer
B. The show ip ospf interfac e brief command on R1 lists the revised Hello timer
C. The R1 - R2 neighborship fails due to Hello timer mismatcH
D. The show ip ospf interface command on R1 lists the revised Hello timer

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类囊体反应。

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ATP车载单元外部静态输入中的ATO启动按钮电压为0V时，表示（）被按压。

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