题目内容

草土围堰是一种草土混合结构,多用()修建。

A. 钢铬法
B. 捆草法
C. 筑草法
D. 加筋法

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下列哪些因素与发展有氧供能系统能力并无密切关系()

A. 人体心肺功能;
B. 肌肉力量;
C. 泌尿系统功能;
D. 消化功能;

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。

A. 正确
B. 错误

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.

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