题目内容

BPCU向地面服务汇流供电的顺序是:()。

APU发电机,主外部电源,右主交流以汇流条
B. 主外部电源,右主交流汇流条,APU发电机
C. 主外部电源.APU发电机,右主交流汇流条
D. 右主交流汇流条,主外部电源,APU发电机

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运输机减速器的作用是降低速度和增大()

A. 传递力矩
B. 输出功率
C. 运行时间

机组负荷增加,可能使汽轮机轴承温度升高。

A. 正确
B. 错误

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Examine the command: SQL> DBMS_STATS.SET_TABLE_PREFS(’SH’, ’CUSTOMERS’, ’PUBLISH’, ’false’); Which statement describes the effect of the above command()

Automatic statistics collection is stopped for the CUSTOMERS table.
B. Statistics for the CUSTOMERS table are locked and cannot be overwritten.
C. Existing statistics for the CUSTOMERS table become unusable for the query optimizer.
D. Subsequently, statistics gathered on the CUSTOMERS table are stored as pending statistics.

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