题目内容

要根据位移观测桩的观测数据对跨区间无缝线路及无缝道岔状况进行（）。

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采用滑车组起吊重物时，当重物提升到最高点时，定滑车与动滑车间的距离要大于安全距离，顺穿时要不小于轮径的（）倍。

A. 3
B. 5
C. 7
D. 8

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富集比

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You are using the control file to maintain information about the database backups that are being performed by Recovery Manager (RMAN). Identify two scenarios is which you must have a recovery catalog.（）

A. To store the backup information of multiple database
B. To restrict the amount of space that is used by the backups
C. To maintain a backup for a certain time is set by the CONTROL_FILE_RECORD_KEEP_TIME parameter.
D. To list the data files that were in a target database at a given time by using the AT option of REPORT SCHEMA command.

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属于汇票必要项目的是（）

A. “付一不付二”的注明
B. 付款时间
C. 对价条款
D. 禁止转让的文字

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