在车载显示器上可显示调车信号、调车进路，但不能显示轨道区段占用状况。
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哪些项目可以不用操作票（）（）、拉开或拆除全站唯一的一组接地刀闸或接地线。
Examine this command: SQL > exec DBMS_STATS.SET_TABLE_PREFS (‘SH’, ‘CUSTOMERS’, ‘PUBLISH’, ‘false’); Which three statements are true about the effect of this command?（）
A. Statistics collection is not done for the CUSTOMERS table when schema stats are gathered.
B. Statistics collection is not done for the CUSTOMERS table when database stats are gathered.
C. Any existing statistics for the CUSTOMERS table are still available to the optimizer at parse time.
D. Statistics gathered on the CUSTOMERS table when schema stats are gathered are stored as pending statistics.
E. Statistics gathered on the CUSTOMERS table when database stats are gathered are stored as pending statistics.
（）是利用树木的营养器官（如枝、干、根、地下茎等）作为造林材料进行造林的方法。主要用于萌芽生根能力强的树种，如杨树、柳树、柽柳、沙柳、紫穗槐等。
A. 播种造林
B. 植苗造林
C. 分殖造林
D. 直播造林
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